“…Firstly, the 70% alcohol extract of PA was separated and seven types of isocoumarins were obtained (see Figure 4). Among them, (3R)-methyl-6,8-dihydroxy-7-formoxyl-3,4dihydroisocoumarin ( 5), (3R)-methyl-6,8-dihydroxy-7-methyl-3,4-dihydroisocoumarin ( 6), (3R)-ethyl-6,8-dihydroxy-3,4-dihydroisocoumarin ( 7), (3S)-hydroxymethyl-6,8-dihydroxy-7methyl-3,4-dihydroisocoumarin (8) are new compounds and (3R)-ethyl-6,8-dihydroxy-7-methyl-3,4-dihydroisocoumarin ( 9), (R)-6-hydroxymellein (10), and (3R)-methyl-7-hydroxymethyl-8hydroxy-3,4-dihydroisocoumarin-6-O-β-D-glucopyranoside (11) are known compounds [49]. When the above components were tested for cytotoxic activity using the MTT method, it was found that compounds 7 and 8 were new compounds and that compound 9 had the effect of inhibiting the activity of tumor cells, i.e., Hep G2 and MCF-7 cells.…”