Patent ID: 7951955

Claim:
A compound of formula IV: or a salt thereof, wherein: R 1 is hydrogen, C 1-4 alkyl, halo, hydroxy, mercapto, trifluoromethyl, amino, mono or di(C 1-4 alkyl)amino, cyano, formyl, —CH═NO—C 1-4 alkyl, C 1-4 alkoxy, C 1-4 alkoxyC 1-4 alkoxy, C 1-4 haloalkoxy, aryloxy, C 1-4 alkylthio, or aryl; A is a bond or CH 2 O; Y is O, S, NH or NMe; Alk is C 1-7 alkylene; R 11 is OR 10 or SR 10 , where R 10 is C 1-4 alkyl; and R 12 and R 13 are each independently hydrogen, halogen, C 1-4 alkyl or C 1-4 alkoxy.