four furocoumarins , two having a linear structure ( psoralen and 8-methyl-psoralen ) and two having an angular structure ( angelicin and 4,5'-dimethyl-angelicin ) , were studied for their mutagenic activity in the hgprt system on v79 chinese hamster cells in culture ( v79/hgprt system ) .
C0016859
furocoumarins
C0016072
psoralen