- wherein x and R.sup.00 are, independently, as defined above, PA0 (b) R.sup.00 R.sup.00 CH(CH.sub.0).sub.y -- wherein y is zero, one, two, three, four or five, R.sup.00 is as defined above, and R.sup.00 is lower alkyl, cycloalkyl, naphthyl, phenyl unsubstituted or substituted with from one through five substituents, 