1,1'-oxybis(3,4-dihydro-1H-isochromene) 1H-2-benzopyran, 1,1'-oxybis[3,4-dihydro- InChI=1/C18H18O3/c1-3-7-15-13(5-1)9-11-19-17(15)21-18-16-8-4-2-6-14(16)10-12-20-18/h1-8,17-18H,9-12H