10,10a-dihydro-7H-7,10-epoxybenzo[c]chromene 7,10-epoxy-7H-dibenzo[b,d]pyran, 10,10a-dihydro- InChI=1/C13H10O2/c1-2-4-10-8(3-1)13-9(7-14-10)11-5-6-12(13)15-11/h1-7,11-13