2H-1,11c-(Epoxymethano)phenanthro[10,1-bc]pyran, picras-3-ene-2,16-dione deriv. 6-.alpha.-Senecioyloxychaparrinone 6.ALPHA.-SENECIOYLOXYCHAPARRINONE 68499-52-5 CHAPARRINONE, 6A-SENECIOYLOXY NSC290494 Picras-3-ene-2,16-dione, 11,20-epoxy-1,11,12-trihydroxy-6-[(3-methyl-1-oxo-2-butenyl)oxy]- Picras-3-ene-2,16-dione, 11,20-epoxy-1,11,12-trihydroxy-6-[(3-methyl-1-oxo-2-butenyl)oxy]-, (1.beta.,6.alpha.,11.beta.,12.alpha.)-