(R*,R*)-(+-)-6,6'-(Oxydiethylidine)bis(7-methoxy-2,2-dimethyl-2H-1-benzopyran) 2H-1-Benzopyran, 6,6'-(oxodiethylidene)bis(7-methoxy-2,2-dimethyl-, (R*,R*)-(-)- 87592-85-6 Encecanescin