portamycin

Streptolydigin

Antibiotic D-45

2-Pyrrolidineacetamide, 4-(2E,4E,6R)-6-(1R,2R,3R,4S,5R)-1,4-dimethylspiro2,9-dioxabicyclo3.3.1non-6-ene-8,2-oxiran-3-yl-1-hydroxy-4-methyl-2,4-heptadienylidene-N,.alpha.-dimethyl-3,5-dioxo-1-(2S,5S,6S)-tetrahydro-5-hydroxy-6-methyl-2H-pyran-2-yl-, (.alpha