label: 1,3-dimethyl-5,10-methanocycloundeca(4,5)furo(2,3-d)pyrimidin- 2,4(1,3H)-dionylium tetrafluoroborate.
label_lc: 1,3-dimethyl-5,10-methanocycloundeca(4,5)furo(2,3-d)pyrimidin- 2,4(1,3h)-dionylium tetrafluoroborate.