8-(2-hydroxypropan-2-yl)-8,9-dihydrofuro[2,3-h]chromen-2-one

8-(1-hydroxy-1-methyl-ethyl)-8,9-dihydrofuro[2,3-h]chromen-2-one

8,9-Dihydro-8-(1-hydroxy-1-methylethyl)-2H-furo[2,3-h]-1-benzopyran-2-one