8-allyl-5-(3-methyl-butoxy)-4-oxo-4H-chromene-2-carboxylic acid 、
乙胺 以to give 5 parts of 8-allyl-5-(3-methyl-n-butoxy)-4-oxo-4H-1-benzopyran-2-carboxylic acid ethylamine salt hemihydrate as a pale yellow solid, m.p. 135°-137° C.的产率得到8-allyl-5-(3-methyl-n-butoxy)-4-oxo-4H-1-benzopyran-2-carboxylic acid ethylamine salt hemihydrate