NOVELTY - An aryloazol-2-yl-cyanoethylamine compound (I) that is enriched in an enantiomer, or its salt is new.    USE - For treating or preventing parasitic infection or infestation in an animal caused by parasite selected from Anaplocephala, Ancylostoma, Anecator, Ascaris, Brugia, Bunostomum, Capillaria, Chabertia, Cooperia, Cyathostomum, Cylicocyclus, Cylicodontophorus, Cylicostephanus, Craterostomum, Dictyocaulus, Dipetalonema, Dipylidium, Dirofilaria, Dracunculus, Echinococcus, Enterobius, Fasciola, Filaroides, Habronema, Haemonchus, Metastrongylus, Moniezia, Necator, Nematodirus, Nippostrongylus, Nippostrongylus, Oesophagostumum, Onchocerca, Ostertagia, Oxyuris, Paracaris, Schistosoma, Strongylus, Taenia, Toxocara, Strongyloides, Toxascaris, Trichinella, Trichuris, Trichostrongylus, Triodontophorous, Uncinaria, Wuchereria, Haemonchus contortus, Ostertagia circumcincta, Trichostrongylus axei, Trichostrongylus colubriformis, Cooperia curticei, Nematodirus battus, fleas, ticks, mites, mosquitoes, flies, fly larvae, lice (claimed).    ADVANTAGE - The compound has high activity and improved safety to user and environment.    DETAILED DESCRIPTION - An aryloazol-2-yl-cyanoethylamine compound of formula (I) that is enriched in an enantiomer, or its salt is new.    P'=C-R1 or N;    Q=C-R2 or N;    V'=C-R8 or N;    W'=C-R9 or N;    X=C-R10 or N;    Y'=C-R11 or N;    R1, R2, R8, R9, R10 and R11=aryl, arylthio, aryloxy, or heteroaryl (all optionally substituted by cyano, nitro, halogen, alkyl, haloalkyl, alkylthio, haloalkylthio, arylthio, alkoxy, haloalkoxy, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, SF5 or methylthioamino), H, amino, amido, cyano, nitro, halogen, alkyl, alkenyl, alkynyl, cycloalkyl, hydroxyalkyl, haloalkyl, alkylthio, haloalkylthio, arylthio, alkoxy, phenoxy, alkoxyalkoxy, cycloalkyloxy, haloalkoxy, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylsulfinyl, haloalkylsulfinyl, SF5, alkylsulfonyl, haloalkylsulfonyl, alkylamino, di(alkyl)amino, alkylcarbonylamino, alkylaminoalkoxy, dialkylaminoalkoxy, alkylaminoalkyl, dialkylaminoalkyl, aminoalkyl, formyl, -C(O)OH;    R3, R4 and R5=cycloalkyl (optionally substituted aryl, heteroaryl (both optionally substituted by cyano, nitro, halogen, alkyl, haloalkyl, alkylthio, haloalkylthio, arylthio, alkoxy, haloalkoxy, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, SF5, alkylamino, or di(alkyl)amino), halogen, alkyl), H, halogen, alkyl, hydroxyalkyl, alkylthioalkyl, haloalkyl, alkyloxyalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, alkylsulfonyloxyalkyl;or    R4+R5+C=cycloalkyl ring;    R6=benzyl (optionally substituted cyano, nitro, halogen, alkyl, haloalkyl, alkylthio, haloalkylthio, arylthio, alkoxy, haloalkoxy, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, SF5, alkylamino, or di(alkyl)amino), H, alkyl, alkoxyalkyl, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylthiocarbonyl;    R7=aryl or heteroaryl (optionally substituted by aryl, aryloxy, heteroaryl, arylthio (all optionally substituted), cyano, nitro, halogen, alkyl, cycloalkyl, haloalkyl, alkylthio, haloalkylthio, alkoxy, cycloalkyloxy, haloalkoxy, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, amino, alkylamino, di(alkyl)amino, SF5, methylthioamino), H, alkyl, cylcoalkyl, haloalkyl, alkoxyalkyl, alkylcarbonyl, haloalkylcarbonyl, alkoxycarbonyl, haloalkoxycarbonyl, alkylthiocarbonyl, heterocyclyl;    Z'=direct bond, C(O), C(S) or S(O)p;    a=1, 2 or 3;and    p=0, 1 or 2.    An INDEPENDENT CLAIM is included for paraciticidal composition (C1) comprising compound (I) and carrier.