The derivatives have the formula
wherein R1 and R2 are each independently selected from the group consisting of hydrogen; alkyl; alkenyl; cycloalkyl; cycloalkyl alkyl; cycloalkenyl; cycloalkenylalkyl; alkylcycloalkyl; alkenylcycloalkyl; alkylcycloalkenyl; phenyl; 5- and 6- membered heterocyclic wherein the heteroatom is nitrogen, oxygen, or sulfur; and said heterocyclic attached through C1-2alkyl;
R3 and R4 are each independently hydrogen or lower alkyl;
Rs is hydrogen, alkyloxymethyl, alkylamino, aralkylamino, N-substituted carboxamido, or aralkyloxy methyl in which the N substituent is benzyl, phenylethyl, or phenylpropyl; and
n is 1 or 2.
导数的计算公式为
其中 R1 和 R2 各自独立地选自氢、烷基、烯基、环烷基、环烷基烷基、环烯基、 环烯基烷基、烷基环烷基、烯基环烷基、烷基环烯基、苯基、杂原子为氮、氧或
硫的 5 和 6 位杂环基以及通过 C1-2 烷基连接的杂环基组成的组;
R3 和 R4 各自独立地为氢或低级烷基;
Rs 是氢、烷氧基甲基、烷基
氨基、芳基
氨基、N-取代的羧基
氨基或芳基氧基甲基,其中 N 取代基是苄、苯乙基或苯丙基;以及
n 为 1 或 2。