Patent ID: 7553849

Claim:
A compound of formula (I) wherein R is selected from methyl, ethyl, n-propyl, iso-propyl, n-butyl and allyl; R′ is selected from hydrogen, straight, branched or cyclic C 1 -C 4 alkyl; straight, branched or cyclic C 1 -C 3 alkoxy; fluoro, chloro, bromo, trifluoromethyl and OCH x F y , wherein x=0, 1, 2, y=1, 2, 3 with the proviso that x+y=3; R″ is selected from hydrogen, fluoro and chloro, with the proviso that R″ is selected from fluoro and chloro only when R′ is selected from floro and chloro; R 3 is selected from hydrogen and straight, branched or cyclic C 1 -C 5 alkyl; R 4 is hydrogen, CH 2 OCOC(CH 3 ) 3 , or COR 4 ′ wherein R 4 ′ is straight or branched C 1 -C 5 alkyl, phenyl, benyl or phenethyl; R 7 is methyl or ethyl; B is C—R 2 ; A is S, R 2 is hydrogen or methyl, with the proviso that R 2 is methyl only when R 3 is not hydrogen; and any tautomer thereof.