6-oxa-13,20-dithia-3,10,17,22,23,24-hexaazatetracyclo[17.2.1.1~5,8~.1~12,15~]tetracosa-5(24),7,12(23),14,19(22),21-hexaene-2,9,16-trione, 4,7-dimethyl-18-[2-(methylthio)ethyl]-, (4S,18R)- InChI=1/C20H22N6O4S3/c1-9-19-26-15(10(2)30-19)18(29)21-6-14-23-12(7-32-14)17(28)24-11(4-5-31-3)20-25-13(8-33-20)16(27)22-9/h7-9,11H,4-6H2,1-3H3,(H,21,29)(H,22,27)(H,24,28)/t9-,11+/m0/s Nostocyclamide M rel-(4R,18S)-4,7-dimethyl-18-[2-(methylthio)ethyl]-6-oxa-13,20-dithia-3,10,17,22,23,24-hexaazatetracyclo[17.2.1.1~5,8~.1~12,15~]tetracosa-1(21),5(24),7,12(23),14,19(22)-hexaene-2,9,16-trione