From the acetone extract of the root of Euphorbia sieboldiana,a new ent-atis-16-ene typediterpenol was isolated and its structure was demonstrated as ent-atis-
Hypocrellin A and B in methanol were autosensitized and photooxygenated to 1,4,6,7 and 2,5,8,9 respectively.1 in methanol was photooxygenated to 6 and 7 under