Showing structure for (1s,13s,15r,18r)-15-{[(3s)-3-hydroxybutanoyl]oxy}-5,7-dioxa-12-azapentacyclo[10.5.2.0¹,¹³.0²,¹⁰.0⁴,⁸]nonadeca-2,4(8),9,16-tetraen-18-yl (2e)-but-2-enoate