3-Biphenyldiazonium, 2'-carboxy-6-hydroxy-tetrafluoroborate, delta-lactone 6H-Dibenzo(b,d)pyran-2-diazonium, 6-oxo-, tetrafluoroborate(1-) (9CI) 73927-76-1 DIBENZO(b,d)PYRAN-1-DIAZONIUM, 6-OXO-, TETRAFLUOROBORATE(1-) NSC 81313