TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Sugar group or substituted sugar group is group of formula (2), (3), and/or (4). Substituent of substituted sugar group is alkyl group with 1-10 carbon atoms, benzyl group, p-methoxybenzyl group, methoxymethyl group, 2-tetrahydropyranyl group, ethoxyethyl group, acetyl group, pivaloyl group, benzoyl group, trimethylsilyl group, triethylsilyl group, tert.-butyldimethylsilyl group, triisopropylsilyl group, or tert.-butyldiphenylsilyl group. Organic solar cell is provided with thin film containing fullerene derivative.R7-R15=H, NH2, thiol group, carboxyl group, phosphoric acid group, phosphate ester group, ester group, thioester group, amide group, NO2, monovalent hydrocarbon group, organo NH2, organosilyl group, organothio group, acyl group, alkyl ether group, or sulfonic acid group.Preferred Processes: Thin film is produced by using homogeneous organic solution which contains fullerene derivative dissolved in organic solvent. Preparation (Disclosed): Fullerene derivative is obtained by reacting benzaldehyde compound, para-xylene solution, fullerene, and sarcosine, refluxing, concentrating reaction liquid, obtaining crude product, subjecting crude product to silica gel column chromatography, and performing reprecipitation. SPECIFIC COMPOUNDS - 2 Compounds (1) are disclosed, e.g. pyrrolidine compound of formula (5) and pyrrolidine compound of formula (7)..    EXAMPLE - Silver oxide (173 mg), 2,3,5,6- tetrafluoro-4-hydroxy benzaldehyde (97 mg), 2,3,4,6-tetra-O-acetyl- alpha -D-glucopyranosyl bromide (308 mg), and quinoline solution (2.5 ml) were stirred for 75 minutes at room temperature under nitrogen stream. After reaction completion, extraction was performed using chloroform (20 ml) and generated insoluble matter was separated by filtration. Extract was washed (5 times) with 1% hydrochloric acid (20 ml), and then washed (5 times) with 1% sodium hydrogencarbonate aqueous solution (20 ml). Organic layer was concentrated under reduced pressure after drying with magnesium sulfate, and brown viscous oil (426 mg) was obtained. Residue was subjected to silica gel column chromatography, and colorless viscous oil (243 mg, 93%) was obtained from hexane-ethyl acetate (2:1 (v/v)) eluted fraction. Recrystallization by hexane-ethyl acetate (3:1 (v/v)) was performed, and 4-(2',3',4',6'-tetra-O-acetyl- beta -D-glucopyranosyloxy)-2,3,5,6-tetrafluoro benzaldehyde was obtained as colorless needle crystal (210 mg, 85%). Dry para-xylene solution (200 ml), fullerene C60 (288 mg), 4-(2',3',4',6'-tetra-O-acetyl- beta -D-glucopyranosyloxy)-2,3,5,6-tetrafluoro benzaldehyde (209 mg), and sarcosine (53 mg) were mixed under nitrogen stream and heated and refluxed for 8 hours. Water was removed from reaction liquid, reaction liquid was concentrated under reduced pressure, and brown solid (515 mg) was obtained and subjected to silica gel column chromatography. Brown solid (226 mg) was obtained from toluene-ethyl acetate (5:1 (v/v)) eluted fraction. Brown solid was dissolved with benzene (20 ml), hexane (30 ml) was added, and reprecipitation was performed. Pyrrolidine compound (5) (200 mg) was obtained as brown solid.