2110-35-2 9-(3-Piperidino-1-propynyl)fluoren-9-ol hydrochloride 9H-Fluoren-9-ol, 9-(3-(1-piperidinyl)-1-propynyl)-, hydrochloride FLUOREN-9-OL, 9-(3-PIPERIDINO-1-PROPYNYL)-, HYDROCHLORIDE