(2a
E,4
E,8
E)-(5′
R,6
R,6′
S
,11
R,13
S,15
S,17a
R,20
R
,20a
R,20b
S)-6′-[(
E)-1,3-Dimetyl-1-butenyl]-3′,4′,5′,6,6′,7,10,11,14,15,17a,20,20a,20b-tetradekahydro-20,20b-dihydroxi-4′-[(
E)-metoxiimino]-5′,6,8,19-tetrametylspiro[11,15-metano-2
H,13
H,17
H-furo[4,3,2-
pq][2,6]bensodioxacyklooktadecin-13,2′-[2
H]pyran]-17-on