emethallicin C

7aβ,15aβ-Epitetrathio-5,5aα,7a,8,8a,13aα,16,16a-octahydro-5α,13-bis[(R)-hydroxyphenylacetoxy]-1H,7H-bisoxepino[3'',4'':4,5:4''',5''':4',5']dipyrrolo[1,2-a:1',2'-d]pyrazine-7,15-dione