7-ethoxy-4-methyl-8-propionyl-2H-chromen-2-one
7-ethoxy-4-methyl-8-propionyl-2H-chromen-2-one ??
??
7-ethoxy-4-methyl-8-propionyl-2H-chromen-2-one C??? ??, ??, ??
7-ethoxy-4-methyl-8-propionyl-2H-chromen-2-one ?? ?? ? ???
???
?? ??
7-ethoxy-4-methyl-8-propionyl-2H-chromen-2-one ?? ??
???( 1)?? ??