OWU owu (1~{R},23~{R},24~{S},25~{R})-14-[[(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl]-7-azanyl-24,25-bis(oxidanyl)-20,20-bis(oxidanylidene)-26-oxa-20$l^{6}-thia-2,4,6,9,14,17,21-heptazatetracyclo[21.2.1.0^{2,10}.0^{3,8}]hexacosa-3,5,7,9-tetraen-11-yn-16-one OWU