"Preferably, the phenolic groups are in a``trans""configuration about the double bond."
The stilbene diol is 4,4'-dihydroxystilbene; 4,4'-dihydroxy-alpha-methylstilbene; 4,4'-dihydroxy-alpha, alpha'-dimethylstilbene; or 4,4'-dihydroxy-alpha, alpha'-diethylstilbene.