| abstract |
The invention concerns compounds of formula (I) in which the subscript and the substituents are defined as: n is 0 or 1 to 4; X is 0 or S; Y is a five-membered aromatic heterocycle ring; R1 is nitro, cyano, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, phenyl or phenoxy; R2 is hydrogen, alkyl, alkenyl, alkinyl or a saturated or unsaturated ring which may include heteroatoms in addition to carbon atoms as ring members. |