" n is 0, 1, or 2 and E is H or OH; B taken individually is hydrogen; R1 ' and B taken together is a member selected from the group consisting of benzhydrylidene and a radical of formula ##STR42## wherein n is 0, 1, or 2 R1 taken individually is a member selected from the group consisting of hydrogen, diphenylmethyl; diphenylmethyl wherein at least one of said phenyls is substituted with from one" . . . .