3-(4-Nitro-benzyloxy)-7,8,9,10-tetrahydro-benzo[c]chromen-6-one;3-[(4-Nitrobenzyl)oxy]-7,8,9,10-tetrahydro-6H-benzo[c]chromen-6-one;6H-Dibenzo[b,d]pyran-6-one, 7,8,9,10-tetrahydro-3-[(4-nitrophenyl)methoxy]-
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