Antibiotic A 83586C;(2S)-2-[(2R,5S,6S)-6-[(2E,4S,6E)-4,6-dimethyl-5-oxoocta-2,6-dien-2-yl]-2-hydroxy-5-methyloxan-2-yl]-2-hydroxy-N-[(3R,6S,9R,16S,17S,20R,23S)-7-hydroxy-20-[(1S)-1-hydroxyethyl]-3,4,6-trimethyl-2,5,8,15,19,22-hexaoxo-17-propan-2-yl-18-oxa-1,4,7,13,14,21,27-heptazatricyclo[21.4.0.09,14]heptacosan-16-yl]butanamide