TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): A raw material containing 2-bromo-acetophenone, bromoaryl ethyl ketone or bromoaromatic heterocyclic ethyl ketone and pyridine (in molar ratio of 1:1) is dissolved in an organic solvent, stirred and filtered to obtain pyridine bromide. The obtained pyridine bromide, diketone, and benzaldehyde, aromatic formaldehyde or aromatic heterocyclic formaldehyde with a molar ratio of 2:1:2 are mixed in presence of inert gas. Ammonium acetate as catalyst is added, mixed, then dissolved the mixture in glacial acetic acid to reflux and filtered, to obtain polyaryl-substituted pyridine derivate by column chromatography or recrystallization. Preferred Component: The organic solvent is methanol, ethanol, tetrahydrofuran, dichloroethane or dioxane. Preferred Definitions:    R1,R3,R3',R4,R4'=methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-amyl, n-hexyl, n-heptyl, n-octyl, 1-hydroxyethyl, 2-hydroxyethyl, 2-hydroxyisobutyl, 1,2-dihydroxyethyl ethyl, 1,3-dihydroxyethyl isopropyl, 2,3-dihydroxyethyl-tert-butyl, 1,2,3-trihydroxyethyl, chloromethyl, 1-chloroethyl, 2-chloroethyl, 2-chloroethylisobutyl, 1,2-dichloroethyl, 1,3-dichloroisopropyl, 2,3-dichloro-tert-butyl, 1,2,3-trichloropropyl, bromomethyl, 1-bromoethyl, 2-bromoethyl, 2-bromoisobutyl, 1,2-dibromoethyl, 1,3-dibromoethyl isopropyl, 2,3-dibromoethyl-tert-butyl, 1,2,3-tribromopropyl, iodomethyl, 1-iodoethyl, 2-iodoethyl, 2-iodoisobutyl, 1,2-diiodoethyl, 1,3-diiodoisopropyl, 2,3-diiodo-tert-butyl, 1,2,3-triiodopropyl, aminomethyl, 1-aminoethyl, 2-aminoethyl, 2-aminoisobutyl, 1,2-diaminoethyl, 1,3-diaminoisopropyl, 2,3-diamino-tert-butyl, 1,2,3-triaminopropyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, adamantyl, methyloxy, ethyloxy, propyloxy, isopropyloxy, n-butyloxy, sec-butyloxy, isobutyloxy, tert-butyloxy, n-amyloxy, n-hexyloxy, n-heptyloxy, n-octyloxy, 1-hydroxyethyloxy, 2-hydroxyethyloxy, 2-hydroxyisobutyloxy, 1,2-dihydroxyethyloxy, 1,3-dichloroisopropyloxy, 2,3-dichloro tert-butyloxy, 1,2,3-trichloropropyloxy, bromomethyloxy, 1-bromoethyloxy, 2-bromoethyloxy, 2-bromoisobutyloxy, 1,2-dibromoethyloxy, 1,3-dibromo isopropyloxy, 2,3-dibromoethyl-tert-butyloxy, 1,2,3-tribromopropyloxy, iodomethyloxy, 1-iodoethyloxy, 2-iodoethyloxy, 2-iodoisobutyloxy, 1,2-diiodoethyloxy, 1,3-diiodoisopropyloxy, 2,3-diiodotert-butyloxy, 1,2,3-triiodopropyloxy, iodomethyloxy, 1-iodoethyloxy, 2-iodoethyloxy, 2-iodoisobutyloxy, 1,2-diiodoethyloxy, 1,3-diiodoisopropyloxy, 2,3-diiodo-tert-butyloxy, 1,2,3-triiodopropyloxy, aminomethyloxy, 1-aminoethyloxy, 2-aminoethyloxy, 2-aminoisobutyloxy, 2-aminoisobutyloxy, 1,2-diaminoethyloxy, 1,3-diaminoisopropyloxy, 2,3-diamino-tert-butyloxy, 1,2,3-triaminopropyloxy, cyanomethyloxy, 1-cyanoethyloxy, 2-cyanoethyloxy, 2-cyanoisobutyloxy, 1,2-dicyanoethyloxy, 1,3-dicyanoisopropyloxy, 2,3-dicyano-tert-butyloxy, 1,2,3-tricyanopropyloxy, nitromethyloxy, 1-nitroethyloxy, 2-nitroethyloxy, 2-nitroisobutyl, 1,2-dinitroethyl, 1,3-dinitroisopropyl, 2,3-dinitro-tert-butyloxy, 1,2,3-trinitropropyloxy, benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl-tert-butyl, alpha -naphthyl methyl, 1- alpha -naphthyl ethyl, 2- alpha -naphthyl ethyl, 1- alpha -naphthylisopropyl, 2- alpha -naphthylisopropyl, beta -naphthylmethyl, 1- beta -naphthylethyl, 2- beta -naphthylethyl, 1- beta -naphthylisopropyl, 2- beta -naphthylisopropyl, 1-pyrrolyl methyl, 2-(1-pyrrolyl)ethyl, p-methyl benzyl, m-methylbenzyl, o-methylbenzyl, p-chlorobenzyl, m-chlorobenzyl, o-chlorobenzyl, p-bromobenzyl, m-bromobenzyl, o-bromobenzyl, p-iodobenzyl, m-iodobenzyl, o-iodobenzyl, p-aminobenzyl, m-aminobenzyl, o-aminobenzyl, p-nitrobenzyl, m-nitrobenzyl, o-nitrobenzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-chloro-2-phenylisopropyl, triphenylmethyl, phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, 1-phenanthryl, 2-phenanthryl, 2-phenanthryl, 3-phenanthryl, 9-phenanthryl, 1-pyrenyl, 2-pyrenyl, 4-pyrenyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, meta-terphenyl-4-yl, meta-terphenyl-3-yl, meta-terphenyl-2-yl, o-cresyl, meta-cresyl, p-cresyl, p-tert-butyl phenyl, p-(2-phenylpropyl)phenyl, 3-methyl-2-naphthyl, 4-methyl-1-naphthyl, 4-methyl-1-anthryl, 4'-methyl biphenylyl, 4'-tert-butyl-p-terphenyl-4-yl, phenyloxy, 1-naphthyloxy, 2-naphthyloxy, 1-anthryloxy, 2-anthryloxy, 9-anthryloxy, 1-phenanthryloxy, 2-phenanthryloxy, 2-phenanthryloxy, 3-phenanthryloxy, 4-phenanthryloxy, 9-phenanthryloxy, 1-pyrenyloxy, 2-pyrenyloxy, 4-pyrenyloxy, 2-biphenylyloxy, 3-biphenylyloxy, 4-biphenylyloxy, p-terphenyl-4-yloxy, p-terphenyl-3-yloxy, p-terphenyl-2-yloxy, meta-terphenyl-4-yloxy, meta-terphenyl-3-yloxy, meta-terphenyl-2-yloxy, o-cresyloxy, meta-cresyloxy, p-cresyloxy, p-tert-butyl phenyloxy, p-(2-phenylpropyl)phenyloxy, 3-methyl-2-naphthyloxy, 4-methyl-1-naphthyloxy, 4-methyl-1-anthryloxy, 4'-methyl biphenylyloxy, 4"-tert-butyl-p-terphenyl-4-yloxy, pyridyloxy, 2-pyridyloxy, 3-pyridyloxy, 4-pyridyloxy, 2-indyloxy, 3-indyloxy, 4-indyloxy, 5-indyloxy, 6-indyloxy, 7-indyloxy, 1-isoindyloxy, 3-isoindyloxy, 4-isoindyloxy, 5-isoindyloxy, 6-isoindyloxy, 7-isoindyloxy, 2-furyloxy, 3-furyloxy, 2-benzofuranyloxy, 3-benzofuranyloxy, 4-benzofuranyloxy, 5-benzofuranyloxy, 6-benzofuranyloxy, 7-benzofuranyloxy, 1-isobenzofuranyloxy, 3-isobenzofuranyloxy, 4-isobenzofuranyloxy, 5-isobenzofuranyloxy, 6-isobenzofuranyloxy, 7-isobenzofuranyloxy, 2-quinolyloxy, 3-quinolyloxy, 4-quinolyloxy, 5-quinolyloxy, 6-quinolyloxy, 7-quinolyloxy, 8-quinolyloxy, 1-isoquinolyloxy, 3-isoquinolyloxy, 4-isoquinolyloxy, 5-isoquinolyloxy, 6-isoquinolyloxy, 7-isoquinolyloxy, 8-isoquinolyloxy, 2-quinoxalinyloxy, 5-quinoxalinyloxy, 6-quinoxalinyloxy, 1-carbazyloxy, 2-carbazyloxy, 3-carbazyloxy, 4-carbazyloxy, 1-phenanthridinyloxy, 2-phenanthridinyloxy, 3-phenanthridinyloxy, 4-phenanthridinyloxy, 6-phenanthridinyloxy, 7-phenanthridinyloxy, 8-phenanthridinyloxy, 9-phenanthridinyloxy, 10-phenanthridinyloxy, 1-acridinyloxy, 2-acridinyloxy, 3-acridinyloxy, 4-acridinyloxy, 9-acridinyloxy, 1,7-phenanthrolin-2-yloxy, 1,7-phenanthrolin-3-yloxy, 1,7-phenanthrolin-4-yloxy, 1,7-phenanthrolin-5-yloxy, 1,7-phenanthrolin-6-yloxy, 1,7-phenanthrolin-8-yloxy, 1,7-phenanthrolin-9-yloxy, 1,7-phenanthrolin-10-yloxy, 1,8-phenanthrolin-2-yloxy, 1,8-phenanthrolin-3-yloxy, 1,8-phenanthrolin-4-yloxy, 1,8-phenanthrolin-5-yloxy, 1,8-phenanthrolin-6-yloxy, 1,8-phenanthrolin-7-yloxy, 1,8-phenanthrolin-9-yloxy, 1,8-phenanthrolin-10-yloxy, 1,9-phenanthrolin-2-yloxy, 1,9-phenanthrolin-3-yloxy, 1,9-phenanthrolin-4-yloxy, 1,9-phenanthrolin-5-yloxy, 1,9-phenanthrolin-6-yloxy, 1,9-phenanthrolin-7-yloxy, 1,9-phenanthrolin-8-yloxy, 1,9-phenanthrolin-10-yloxy, 1,10-phenanthrolin-2-yloxy, 1,10-phenanthrolin-3-yloxy, 1,10-phenanthrolin-4-yloxy, 1,10-phenanthrolin-5-yloxy, 2,9-phenanthrolin-1-yloxy, 2,9-phenanthrolin-3-yloxy, 2,9-phenanthrolin-4-yloxy, 2,9-phenanthrolin-5-yloxy, 2,9-phenanthrolin-6-yloxy, 2,9-phenanthrolin-7-yloxy, 2,9-phenanthrolin-8-yloxy, 2,9-phenanthrolin-10-yloxy, 2,8-phenanthrolin-1-yloxy, 2,8-phenanthrolin-3-yloxy, 2,8-phenanthrolin-4-yloxy, 2,8-phenanthrolin-5-yloxy, 2,8-phenanthrolin-6-yloxy, 2,8-phenanthrolin-7-yloxy, 2,8-phenanthrolin-9-yloxy, 2,8-phenanthrolin-10-yloxy, 2,7-phenanthrolin-1-yloxy, 2,7-phenanthrolin-3-yloxy, 2,7-phenanthrolin-4-yloxy, 2,7-phenanthrolin-5-yloxy, 2,7-phenanthrolin-6-yloxy, 2,7-phenanthrolin-8-yloxy, 2,7-phenanthrolin-9-yloxy, 2,7-phenanthrolin-10-yloxy, 1-phenazinyloxy, 2-phenazinyloxy, 1-phenothiazinyloxy, 2-phenothiazinyloxy, 3-phenothiazinyloxy, 4-phenothiazinyloxy, 1-phenoxazinyloxy, 2-phenoxazinyloxy, 3-phenoxazinyloxy, 4-phenoxazinyloxy, 2-oxazolyloxy, 4-oxazolyloxy, 5-oxazolyloxy, 2-oxadizolyloxy, 5-oxadizolyloxy, 3-furazanyloxy, 2-thienyloxy, 3-thienyloxy, 2-methyl-pyrrol-1-yloxy, 2-methyl-pyrrol-3-yloxy, 2-methyl-pyrrol-4-yloxy, 2-methyl-pyrrol-5-yloxy, 3-methyl-pyrrol-1-yloxy, 3-methyl-pyrrol-2-yloxy, 3-methyl-pyrrol-4-yloxy, 3-methyl-pyrrol-5-yloxy, 2-tert-butyl pyrrol-4-yloxy, 3-(2-phenylpropyl)pyrrol-1-yloxy, 2-methyl-1-indyloxy, 4-methyl-1-indyloxy, 2-methyl-3-indyloxy, 4-methyl-1-indyloxy, 2-tert-butyl-1-indyloxy, 4-tert-butyl-1-indyloxy, 2-tert-butyl-3-indyloxy, 4-tert-butyl-3-indyloxy, 1-pyrryl, 2-pyrryl, 3-pyrryl, 1-pyridyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-indyl, 2-indyl, 3-indyl, 4-indyl, 5-indyl, 6-indyl, 7-indyl, 1-isoindyl, 3-isoindyl, 4-isoindyl, 5-isoindyl, 6-isoindyl, 7-isoindyl, 2-furyl, 3-furyl, 2-benzofuranyl, 3-benzofuranyl, 4-benzofuranyl, 5-benzofuranyl, 6-benzofuranyl, 7-benzofuranyl, 1-isobenzofuranyl, 3-isobenzofuranyl, 4-isobenzofuranyl, 5-isobenzofuranyl, 6-isobenzofuranyl, 7-isobenzofuranyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 6-quinolyl, 7-quinolyl, 8-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl, 6-isoquinolyl, 7-isoquinolyl, 8-isoquinolyl, 2-quinoxalinyl, 5-quinoxalinyl, 6-quinoxalinyl, 1-carbazyl, 2-carbazyl, 3-carbazyl, 4-carbazyl, 9-carbazyl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinyl, 2-acridinyl, 3-acridinyl, 4-acridinyl, 9-acridinyl, 1,7-phenanthrolin-2-yl, 1,7-phenanthrolin-3-yl, 1,7-phenanthrolin-4-yl, 1,7-phenanthrolin-5-yl, 1,7-phenanthrolin-6-yl, 1,7-phenanthrolin-8-yl, 1,7-phenanthrolin-9-yl, 1,7-phenanthrolin-10-yl, 1,8-phenanthrolin-2-yl, 1,8-phenanthrolin-3-yl, 1,8-phenanthrolin-4-yl, 1,8-phenanthrolin-5-yl, 1,8-phenanthrolin-6-yl, 1,8-phenanthrolin-7-yl, 1,8-phenanthrolin-9-yl, 1,8-phenanthrolin-10-yl, 1,9-phenanthrolin-2-yl, 1,9-phenanthrolin-3-yl, 1,9-phenanthrolin-4-yl, 1,9-phenanthrolin-5-yl, 1,9-phenanthrolin-6-yl, 1,9-phenanthrolin-7-yl, 1,9-phenanthrolin-8-yl, 1,9-phenanthrolin-10-yl, 1,10-phenanthrolin-2-yl, 1,10-phenanthrolin-3-yl, 1,10-phenanthrolin-4-yl, 1,10-phenanthrolin-5-yl, 2,9-phenanthrolin-1-yl, 2,9-phenanthrolin-3-yl, 2,9-phenanthrolin-4-yl, 2,9-phenanthrolin-5-yl, 2,9-phenanthrolin-6-yl, 2,9-phenanthrolin-7-yl, 2,9-phenanthrolin-8-yl, 2,9-phenanthrolin-10-yl, 2,8-phenanthrolin-1-yl, 2,8-phenanthrolin-3-yl, 2,8-phenanthrolin-4-yl, 2,8-phenanthrolin-5-yl, 2,8-phenanthrolin-6-yl, 2,8-phenanthrolin-7-yl, 2,8-phenanthrolin-9-yl, 2,8-phenanthrolin-10-yl, 2,7-phenanthrolin-1-yl, 2,7-phenanthrolin-3-yl, 2,7-phenanthrolin-4-yl, 2,7-phenanthrolin-5-yl, 2,7-phenanthrolin-6-yl, 2,7-phenanthrolin-8-yl, 2,7-phenanthrolin-9-yl, 2,7-phenanthrolin-10-yl, 1-phenazinyl, 2-phenazinyl, 1-phenothiazinyl, 2-phenothiazinyl, 3-phenothiazinyl, 4-phenothiazinyl, 10-phenothiazinyl, 1-phenoxazinyl, 2-phenoxazinyl, 3-phenoxazinyl, 4-phenoxazinyl, 10-phenoxazinyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadizolyl, 5-oxadizolyl, 3-furazanyl, 2-thienyl, 3-thienyl, 2-methyl-pyrrol-1-yl, 2-methyl-pyrrol-3-yl, 2-methyl-pyrrol-4-yl, 2-methyl-pyrrol-5-yl, 3-methyl-pyrrol-1-yl, 3-methyl-pyrrol-2-yl, 3-methyl-pyrrol-4-yl, 3-methyl-pyrrol-5-yl, 2-tert-butyl pyrrol-4-yl, 3-(2-phenylpropyl)pyrrol-1-yl, 2-methyl-1-indyl, 4-methyl-1-indyl, 2-methyl-3-indyl, 4-methyl-1-indyl, 2-tert-butyl-1-indyl, 4-tert-butyl-1-indyl, 2-tert-butyl-3-indyl or 4-tert-butyl-3-indyl;    R2,R2',R5,R5'=monofluoro-, difluoro- or trifluoro-substituted methyl, carbomethoxy, carbethoxy, isopropyl ester, n-butyl ester, sec-butyl ester, isobutyl ester, n-amyl ester, n-hexyl ester, n-heptyl ester or n-octyl ester;and    Ar1,Ar1',Ar2,Ar2'=phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, 1-pyrenyl, 2-pyrenyl, 4-pyrenyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, meta-terphenyl-4-yl, meta-terphenyl-3-yl, meta-terphenyl-2-yl, o-cresyl, meta-cresyl, p-cresyl, p-tert-butyl phenyl, p-(2-phenylpropyl)phenyl, 3-methyl-2-naphthyl, 4-methyl-1-naphthyl, 4-methyl-1-anthryl, 4'-methyl biphenylyl, 4"-tert-butyl-p-terphenyl-4-yl, 1-pyrryl, 2-pyrryl, 3-pyrryl, pyridyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-indyl, 2-indyl, 3-indyl, 4-indyl, 5-indyl, 6-indyl, 7-indyl, 1-isoindyl, 3-isoindyl, 4-isoindyl, 5-isoindyl, 6-isoindyl, 7-isoindyl, 2-furyl, 3-furyl, 2-benzofuranyl, 3-benzofuranyl, 4-benzofuranyl, 5-benzofuranyl, 6-benzofuranyl, 7-benzofuranyl, 1-isobenzofuranyl, 3-isobenzofuranyl, 4-isobenzofuranyl, 5-isobenzofuranyl, 6-isobenzofuranyl, 7-isobenzofuranyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 6-quinolyl, 7-quinolyl, 8-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl, 6-isoquinolyl, 7-isoquinolyl, 8-isoquinolyl, 2-quinoxalinyl, 5-quinoxalinyl, 6-quinoxalinyl, 1-carbazyl, 2-carbazyl, 3-carbazyl, 4-carbazyl, 9-carbazyl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinyl, 2-acridinyl, 3-acridinyl, 4-acridinyl, 9-acridinyl, 1,7-phenanthrolin-2-yl, 1,7-phenanthrolin-3-yl, 1,7-phenanthrolin-4-yl, 1,7-phenanthrolin-5-yl, 1,7-phenanthrolin-6-yl, 1,7-phenanthrolin-8-yl, 1,7-phenanthrolin-9-yl, 1,7-phenanthrolin-10-yl, 1,8-phenanthrolin-2-yl, 1,8-phenanthrolin-3-yl, 1,8-phenanthrolin-4-yl, 1,8-phenanthrolin-5-yl, 1,8-phenanthrolin-6-yl, 1,8-phenanthrolin-7-yl, 1,8-phenanthrolin-9-yl, 1,8-phenanthrolin-10-yl, 1,9-phenanthrolin-2-yl, 1,9-phenanthrolin-3-yl, 1,9-phenanthrolin-4-yl, 1,9-phenanthrolin-5-yl, 1,9-phenanthrolin-6-yl, 1,9-phenanthrolin-7-yl, 1,9-phenanthrolin-8-yl, 1,9-phenanthrolin-10-yl, 1,10-phenanthrolin-2-yl, 1,10-phenanthrolin-3-yl, 1,10-phenanthrolin-4-yl, 1,10-phenanthrolin-5-yl, 2,9-phenanthrolin-1-yl, 2,9-phenanthrolin-3-yl, 2,9-phenanthroline-4-yl, 2,9-phenanthrolin-5-yl, 2,9-phenanthrolin-6-yl, 2,9-phenanthrolin-7-yl, 2,9-phenanthrolin-8-yl, 2,9-phenanthrolin-10-yl, 2,8-phenanthrolin-1-yl, 2,8-phenanthrolin-3-yl, 2,8-phenanthrolin-4-yl, 2,8-phenanthrolin-5-yl, 2,8-phenanthrolin-6-yl, 2,8-phenanthrolin-7-yl, 2,8-phenanthrolin-9-yl, 2,8-phenanthrolin-10-yl, 2,7-phenanthrolin-1-yl, 2,7-phenanthrolin-3-yl, 2,7-phenanthrolin-4-yl, 2,7-phenanthrolin-5-yl, 2,7-phenanthrolin-6-yl, 2,7-phenanthrolin-8-yl, 2,7-phenanthrolin-9-yl, 2,7-phenanthrolin-10-yl, 1-phenazinyl, 2-phenazinyl, 1-phenothiazinyl, 2-phenothiazinyl, 3-phenothiazinyl, 4-phenothiazinyl, 10-phenothiazinyl, 1-phenoxazinyl, 2-phenoxazinyl, 3-phenoxazinyl, 4-phenoxazinyl, 10-phenoxazinyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadizolyl, 5-oxadizolyl, 3-furazanyl, 2-thienyl, 3-thienyl, 2-methyl-pyrrol-1-yl, 2-methyl-pyrrol-3-yl, 2-methyl-pyrrol-4-yl, 2-methyl-pyrrol-5-yl, 3-methyl-pyrrol-1-yl, 3-methyl-pyrrol-2-yl, 3-methyl-pyrrol-4-yl, 3-methyl-pyrrol-5-yl, 2-tert-butyl pyrrol-4-yl, 3-(2-phenylpropyl)pyrrol-1-yl, 2-methyl-1-indyl, 4-methyl-1-indyl, 2-methyl-3-indyl, 4-methyl-1-indyl, 2-tert-butyl-1-indyl, 4-tert-butyl-1-indyl, 2-tert-butyl-3-indyl or 4-tert-butyl-3-indyl.