178943-66-3 3-Oxa-12,21-dithia-15,22-diazatetracyclo(16.2.1.110,13.02,4)docosa-6,8,10,13(22)-tetraene-18-acetic acid, alpha-hydroxy-alpha,1,14-trimethyl-5,16-dioxo-, (1S-(1R*,2S*,4S*,6E,8Z,14S*,18S*(R*)))-