Compounds of the formula: ##STR1## wherein R is alkyl having 1 to 6 carbon atoms; A is substituted or unsubstituted alkyl having 1 to 6 carbon atoms, aralkyl having 7 to 16 carbon atoms wherein the alkyl or aralkyl groups are unbranched in the 1-position or an acyl group derived from an aliphatic or aromatic carboxylic acid; B is hydrogen; or A and B together form an optionally substituted alkylidene having 2 to 8 carbon atoms or an aralkylidene group having 7 to 18 carbon atoms where the alkylidene and aralkylidene groups are unbranched in the 1-position or pharmaceutically acceptable salts thereof are disclosed. The compounds have vasodilating properties.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of copending U.S. application Ser. No. 010,720 filed Feb. 8, 1979, now abandoned, and claiming a Hungarian priority date of Feb. 10, 1978.
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