17976-83-9 2,5-Cyclohexadiene-1,4-dione, 2-hydroxy-5,6-dimethoxy-3-(3,7,11,15-tetramethyl-2-hexadecenyl)- 2,5-Cyclohexadiene-1,4-dione, 2-hydroxy-5,6-dimethoxy-3-(3,7,11,15-tetramethyl-2-hexadecenyl)-, [R-[R*,R*-(E)]]- NSC277818