K. 9,9'-oxybis[(5R,5aR,8aR,9S)-5-(4-hydroxy-3,5-dimethoxyfenyl)-5,8,8a,9-tetrahydroisobenzofuro[5,6-f][1,3]benzodioxol-6(5aH)-on] (bis-4ˊ-O-demethylepipodofylotoxin),
K. 9,9'-oxybis[(5R,5aR,8aR,9S)-5-(4-hydroxy-3,5-dimethoxyfenyl)-5,8,8a,9-tetrahydroisobenzofuro[5,6-f][1,3]benzodioxol-6(5aH)-on] (bis-4ˊ-O-demethylepipodofylotoxin),