2H-1-Benzopyran-2-one, 7-((4-(dimethylamino)-2-butynyl)oxy)-4-methyl-, hydrochloride 4-Methyl-7-(4-dimethylamino-2-butinyloxy)-cumarin hydrochlorid [German] 67268-59-1 7-((4-(Dimethylamino)-2-butynyl)oxy)-4-methyl-2H-1-benzopyran-2-one hydrochloride