Chemical investigation of an Assamese collection of Micromelum minutum gave four known coumarins (osthol, micromehn, murralongin and murrangatin) and five new coumarins, dihydromicromehn A and B, acetyldihydromicromehn A, the three diastereomer of murrangatin, the 7,12-ether of 5,7-dihydroxy-3,6,8,4'-tetramethoxytlavone and murrangatin