6,15b-(Epoxyethano)-11H,15bH-naphtho[2,3-d]naphtho[2,3-b:6,7-c']dipyran-5,9,14,16-tetrone,5a,6,10,13-tetrahydro-4,8,15-trihydroxy-2-methoxy-6,11,13,18-tetramethyl-,[5aS-(5aa,6b,11a,13a,15bb,18S*)]-