retrodiene是什么意思

医药化学名词,似乎是什么应该是某类化合物.
Based on the materials of the levopimaric and lambertian acids diterpenoids study thenew conception of reactions of diene and retrodiene synthesis was advanced. New ways of synthesis of alkaloid like structures based on diterpenoids of abietanic and labdanic row were suggested. For the first time the programe regarding studying the transformations of diterpenic alkaloids was carried out. The prospective of metal complex catalysis methods was demonstrated as well. The new antiarrythmic agents were offered for pre clinic aprobation. High active tumor cells apoptosis inductors were revealed.

无意义啊，电子词典上找不到