4b,9b-dihydrobenzo[b]benzofuro[2,3-d]furan

2-(2'hydroxy-2',3'-dihydrobenzofuran-3'yl)phenol

3-(Trifluoroacetyl)-2H-chromen-2-one

3-(2,2,2-trifluoro-1,1-dihydroxyethyl)-2H-chromen-2-one