 (i) alkyl of from one to fifteen carbons, inclusive, PA0 (ii) ##STR0## wherein R.sup.00 and y are, independently, as defined above, and R.sup.00 is H, lower alkyl, cycloalkyl, naphthyl, phenyl unsubstituted or substituted with from one through five substituents, preferably from one through three substituents, comprising alkyl, halo, trifluoromethyl, amino, N-lower monoalkylamino, N,N-lower dialkylamino, lower thioalkyl, lower alkylsulfonyl, 