Abstract: AI-77 compounds, pharmaceutically acceptable salts thereof, and a process for the preparation thereof are described, said compounds having the formulae ##STR1## wherein: X is NR.sub.6 or O; Y is NHR.sub.5 or combine with Z to provide a link for bonding C and C; Z is H or combines with Y to provide a link for bonding C and C; R.sub.1, R.sub.3 and R.sub.5 are each H, R', --CH.sub.2 R, or --COR; R.sub.6 is H or R; R.sub.7 is H, R or CH.sub.2 R; R is a hydrocarbon group consisting of a saturated or unsaturated straight or branched aliphatic group of C.sub.1 to C.sub.17, an aromatic group of C.sub.6 to C.sub.10, a cage type group of C.sub.7 to C.sub.10, a monocyclic aliphatic group of C.sub.3 to C.sub.8, an aromatic-aliphatic group of C.sub.7 to C.sub.15, a heterocyclic hydrocarbon of C.sub.1 to C.sub.9, wherein the above hydrocarbons can be substituted with one or more groups selected from halogen, oxo, carboxyl, hydroxyl, a saturated or unsaturated straight or branched aliphatic group of C.sub.1 to C.sub.