A1A9B a1a9b (10S,11R,12S,15S,18S)-15-(2-amino-2-oxoethyl)-10,11,23-trihydroxy-18-{[(3R)-3-methyl-2-oxopentanoyl]amino}-9,14,17-trioxo-N-[(1Z)-prop-1-en-1-yl]-8,13,16-triazatetracyclo[18.3.1.0(2,7).0(6,10)]tetracosa-1(24),2,4,6,20,22-hexaene-12-carboxamide A1A9B