A novel 24-membered polyene lactam macrolide, micromonosporin A (=(3E,5E,7Z,15E,17E,19E,21E)-9,11,13-trihydroxy-14,19,24-trimethyl-1-azacyclotetracosa-3,5,7,15,17,19,21-heptaen-2-one; 1) was isolated from the actinomycete, Micromonospora sp. strain TT1-11, which was isolated from a very acidic peat swamp forest.
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