I. (5R,5aR,8aR,9S)-9-[(4,6-0-(R)-ethyliden-β -D-glukopyranosyl)oxy]-5-(3,4,5-trimethoxyfenyl)-5,8,8a,9-tetrahydroisobenzofuro[5,6-H][1,3]benzodioxol-6(5aH-on (4-0-methylethylidenlignan P),