(1S,5R,13R,17S)-4-(cyclopropylmethyl)-9-[(1S,2S,6R,14S)-15-(cyclopropylmethyl)-2,9-dihydroxy-5-oxo-15-aza-7-oxapentacyclo[10.5.1.01,6.08,18.02,14]octadeca-8(9),10,12(18)-trien-10-yl]-10,17-dihydroxy-4-aza-12-oxapentacyclo[9.6.1.01,13.05,17.07,18]octadeca-7(8),9,11(18)-trien-14-one