-C6)alkyloxycarbonyl, mono-N- or di-N,N-(C1 -C6)alkylamino or said (C1 -C6)alkyl or (C2 -C6)alkenyl substituents are optionally substituted with from one to nine fluorines; R4 is Q1 or V1 wherein Q1 a fully saturated, partially unsaturated or fully unsaturated one to six membered straight or branched carbon chain wherein the carbons, other than the connecting carbon, may optionally be replaced wit