| http://www.w3.org/ns/prov#value | - The present gastroprokinetic compounds differ in structure mainly by the presence of a hydroxy- or an alkyloxy group on the central piperidine ring.WO 93/16072, published on Aug. 19, 1993 discloses 5-amino-N-[(1-butyl-4-piperidinyl)methyl]-6-chloro-3,4-dihydro-2H-1-benzo- pyran-8-carboxamide having HT.sub.4 receptor antagonistic activity.Bioorganic & Medicinal Chem.
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