(-)-Arctigenin 2(3H)-Furanone, 4-((3,4-dimethoxyphenyl)methyl)dihydro-3-((4-hydroxy-3-methoxyphenyl)methyl)-, (3R-trans)- 7770-78-7 AIDS-002466 AIDS002466 Arctigenen Dibenzylbutyrolactone lignanolide