2H-Pyran-3(6H)-one, 2-[[(3β,20S)-20-[(2,6-dideoxy-β-D-arabino-hexopyranosyl)oxy]-17-hydroxypregn-5-en-3-yl]oxy]-4-methoxy-6-methyl-; 2-[[(3β,20S)-20-[(2,6-Dideoxy-β-D-arabino-hexopyranosyl)oxy]-17-hydroxypregn-5-en-3-yl]oxy]-4-methoxy-6-methyl-2H-pyran-3(6H)-one; (-)-Periplocoside M; Periplocoside M