Compounds of formula V ##STR1## and C.sub.1 -C.sub.6 carboxylic acid esters thereof, wherein R.sub.1 is selected from the group consisting of CH.sub.3, C.sub.2 H.sub.5, n-C.sub.3 H.sub.7, isoC.sub.3 H.sub.7, CH.sub.2 --O--CH.sub.3, CH.sub.2 --O--C.sub.2 H.sub.5, CH.sub.2 --O--CHF.sub.2 and cyclopropyl and R.sub.2 is cyclopropyl or C.sub.1 -C.sub.3 alkyl.
公式为V ##STR1##的化合物及其C.sub.1-C.sub.6
羧酸酯,其中R.sub.1选择自CH.sub.3、C.sub.2H.sub.5、n-C.sub.3H.sub.7、isoC.sub.3H.sub.7、CH.sub.2--O--CH.sub.3、CH.sub.2--O--C.sub.2H.sub.5、CH.sub.2--O--CHF.sub.2和环丙基,R.sub.2为环丙基或C.sub.1-C.sub.3烷基。