O-sinapoyltransferase activity sinapoylglucose-choline O-sinapoyltransferase activity https://github.com/geneontology/go-ontology/issues/30193 sinapine synthase activity MetaCyc:2.3.1.91-RXN EC:2.3.1.91 GO:0047202 molecular_function KEGG_REACTION:R03075 Catalysis of the reaction: 1-O-sinapoyl-beta-D-glucose + choline = O-sinapoylcholine + D-glucose. RHEA:12024 1-O-(4-hydroxy-3,5-dimethoxycinnamoyl)-beta-D-glucose:choline 1-O-(4-hydroxy-3,5-dimethoxycinnamoyl)transferase activity