1. Endoparazititsidnoe agent containing a compound of formula (I) wherein X represents a mono- or poly-N-substituted phenyl, thienyl or furanyl Q represents a mono- or poly-N-substituted pyridyl, thienyl, furanyl or isothiazolyl Y represents hydrogen or represents if appropriate a mono- or poly-N-substituted (C-C) alkyl, (C-C) -alkenyl, (C) -alkynyl, (C-C) -galoalkil, (C -C) -galoalkenil, (C-C) -galoalkinil, (C-C) alkoxy, (C-C) -alkeniloksi, (C-C) -alkiniloksi, (C-C) -cycloalkyl- (C ) -alkyl, or represents a mono-, if necessary, Is poly-N-substituted 3-14-membered cyclic group W represents oxygen or sulfur Lpredstavlyaet is -C (R, R) -, oxygen, sulfur or -N (R) - Lpredstavlyaet is -C (R, R) - Lpredstavlyaet is -C (R, R) - or a direct bond Mpredstavlyaet hydrogen, halogen, cyano, nitro, OH, (C-C) alkyl, (C-C) -galoalkil, (C ) -alkoxy, (C) -galoalkoksi, (C-C) -alkylthio, (C-C) -galoalkiltio, (C-C) alkylsulfonyl, (C-C) -galoalkilsulfonil, (C) - alkylsulfanyl, (C-C) -galoalkilsulfanil (3-14-membered cyclic group) -O- R is hydrogen or optionally mono- or poly-substituted by M enny (C-C) alkyl, (C-C) -alkenyl, (C) -alkynyl, (C-C) -galoalkil, (C-C) -galoalkenil, (C-C) -galoalkinil ( C-C) cycloalkyl - (C-C) -alkyl, or represents if appropriate mono- or poly-N-substituted 3-14-membered cyclic group R, each independently from each other represents hydrogen, halogen or necessary mono- or poly-N-substituted (C-C) alkyl, (C-C) -alkenyl, (C) -alkynyl, (C-C) -galoalkil, (C-C) -galoalkenil ( C-C) -galoalkinil, (C-C) alkoxy, (C-C) -alkeniloksi, (C-C) -alkiniloksi, (C-C) cycloalkyl- (C-C) -alkyl, or represents if necessary, MO
