Phentolamine-d4 hydrochloride 20751 InChi: InChI=1S/C26H26ClN5O/c27-17-24(28)29-16-6-11-23(25-30-21-9-4-5-10-22(21)31-25)32-26(33)20-14-12-19(13-15-20)18-7-2-1-3-8-18/h1-5
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