2,2'-Bis-(1-adaMantyl)-4,4'-diMethoxybiphenyl;1,1'-(4,4'-DiMethoxy[1,1'-biphenyl]-3,3'-diyl)bistricyclo[3.3.1.13,7]decane;Adapalene Related CoMpound D;4,4′-Dimethoxy-3,3′-di(adamant-1-yl)biphenyl;Adapalene Related Compound D (25 mg) (4,4'-dimethoxy-3,3'-di(adamant-1-yl)biphenyl);ADAP-IMC;Adapalene EP Impurity D;Adapalene Impurity 3