A compound having the structural formula ##STR1## wherein Y is hydrogen, bromine, phenyl or C.sub.1 -C.sub.4 alkyl; R is C.sub.1 -C.sub.10 alkyl, R.sup.1 and R.sup.2 independently are C.sub.1 -C.sub.6 alkyl or R.sup.1 and R.sup.2 together form a ring with the nitrogen to which they are attached having 3-8 carbon atoms, optionally substituted with one or two methyl groups.
一种化合物的结构式为##STR1## 其中Y是氢、
溴、苯基或C.sub.1-C.sub.4烷基;R是C.sub.1-C.sub.10烷基,R.sup.1和R.sup.2独立地是C.sub.1-C.sub.6烷基,或者R.sup.1和R.sup.2与它们所连接的氮原子形成一个环,该环具有3-8个碳原子,可选地取代一个或两个甲基基团。