2H-1,4-Benzoxazin-3(4H)-one , with CAS number of 6093-68-1, can be called 2H-1-Benzopyran-2-one, 6-hydroxy- ; 6-Hydroxy-2h-chromen-2-one ; 6-hydroxycoumarin ; 6-Hydroxy-2H-chromen-2-one 97% ; 6-Hydroxy-2H-1-benzopyran-2-one .