alterporriol D

(5S)-5,5',6,6',7,7',8,8'-Octahydro-4,4',5α,5'α,6β,6'β,7β,7'β,8α,8'α-decahydroxy-2,2'-dimethoxy-7,7'-dimethyl-1,1'-bianthracene-9,9',10,10'-tetrone