1-Aza-5H-dibenzo(a,d)cyclohepten-5-ol, 10,11-dihydro-5-ethynyl- 31721-91-2 5H-BENZO(4,5)CYCLOHEPTA(1,2-b)PYRIDIN-5-OL, 10,11-DIHYDRO-5-ETHYNYL- BRN 1469717