17,19-Etheno-22H-benzofuro(3,3a-p)(1,5,10)triazacycloeicosine-3,14,22-trione, 4,5,6,7,8,9,10,11,12,13,20a,21,23,24-tetradecahydro-, (1Z,15Z,20aR,24aS)-rel- 79298-93-4