Abstract
Studies on the structures of new components of leucomycin, A4(IV), A5(III), A6(VI), A7(V), A8(VIII) and A9(VII), were carried out in parallel with those on components A1(I) and A3(II), namely acetylation, and acid and alkaline hydrolysis. The pairs of components IV and III, VIandV, and VIIand VIII gave respectively, acetates X, XI and XIII. Components IV, VI and VIII had then respectively, 4-O-n-butyryl-, 4-O-propionyl- and 4-O-acetyl-mycarose replacing the 4-O-isovaleryl mycarose in the A3. Like A3, components IV, VI and VII had an O-acetyl group on C-3 of the 16-membered lactone.
