Abstract: Compounds of formula (1), (Gibberellins), and their pharmaceutically acceptable derivatives to promote ulcer-healing, healing of surgical wounds or open fractures and treatment of bronchitis or thrombophlebitis in animals including humans or cultivation of skin cell lines in vitro ##STR1## wherein A is COOR, where R is hydrogen, unsubstituted or substituted C.sub.1-20 alkyl, allyl, aryl, arylalkyl, amidine, NR.sup.4 R.sup.5 or an unsaturated or saturated ring containing one or more hetero-atoms selected from the group consisting of nitrogen, oxygen and sulfur; R.sup.4 and R.sup.5 may or may not be the same, are hydrogen, or C.sub.1-20 alkyl, allyl, aryl, arylalkyl or an unsaturated or saturated ring containing one or more hetero-atoms selected from the group consisting of nitrogen and sulfur; B is hydrogen, hydroxyl, mercaptan, or halogen, or A and B together form a --CO--O-- linkage; R.sup.1 is hydrogen, hydroxyl, mercaptan, halogen, amino, azido, NR.sup.4 R.sup.5, unsubstituted or substituted C.sub.