12,13-Dihydro-12,13-epoxyleucomycin V 3,4b-diacetate 9-propanoate 35775-83-8 9-Propionylmaridomycin VI BRN 1615336 Leucomycin V, 12,13-dihydro-12,13-epoxy-, 3,4b-diacetate 9-propanoate Propionylmaridomycin VI