title: [Studies on the synthesis of coumarin derivatives. XXV. On the preparations of the nitro-derivatives of 4-methyl-6-acetyl-7-hydroxy-coumarin and 4-methyl-7-hydroxy-8-acetylcoumarin].
mesh_terms: D003374:Coumarins / Q000138:chemical synthesis*; D007259:Infrared Rays; D013057:Spectrum Analysis
chemical_list: D003374:Coumarins