Objective: To investigate the chemical constituents of Melissa officinalis leaves.
Methods: The chemical constituents were separated by silica gel column chromatography and their structures were determined by spectroscopic experiments.
Results: 13 compounds were isolated and identified as protocatechuyl aldehyde(1), serratagenic acid(2), vanillin(3), 2α,3β-dihydroxy-urs-12-en-28-oic acid(4), ursolic acid(5), oleanolic acid(6), daucosterol(7),2α,3β,23,29-tetrahydroxyolean-12-en-28-oic acid-29-O-β-D-gluco- pyranoside(8), luteolin(9) rosmarinic acid(10), luteolin-7-O-β-D-glucoside (11), β-stitosterol(12) and palmitic acid(13).
Conclusion: Compounds 1 ~ 8 are separated from this plant for the first time and compounds 1-4 and 8 are isolated from this genus for the first time.