101605-39-4 2-(Carbazol-9-ylmethyl)-5-hydroxy-4H-pyran-4-one 4-20-00-03850 (Beilstein Handbook Reference) 4H-Pyran-4-one, 2-(carbazol-9-ylmethyl)-5-hydroxy- 5-Hydroxy-2-(9-carbazolylmethyl)-4H-pyran-4-one BRN 0277224