sakyomicin C

(3R)-3,4,4a,12b-Tetrahydro-3α,4aβ,8-trihydroxy-3-methyl-12bβ-[[(2S,5S,6S)-tetrahydro-5-hydroxy-6-methyl-2H-pyran-2-yl]oxy]benz[a]anthracene-1,7,12(2H)-trione