2,2,5-Trimethyl-6-methoxy-7-(2-propynyloxy)-2H-1-benzopyran
2,2,5-Trimethyl-6-methoxy-7-(2-propynyloxy)-2H-1-benzopyran ??
??
2,2,5-Trimethyl-6-methoxy-7-(2-propynyloxy)-2H-1-benzopyran C??? ??, ??, ??
2,2,5-Trimethyl-6-methoxy-7-(2-propynyloxy)-2H-1-benzopyran ?? ?? ? ???
???
?? ??
2,2,5-Trimethyl-6-methoxy-7-(2-propynyloxy)-2H-1-benzopyran ?? ??
???( 0)?? ??