foliar levels of phototoxic furanocoumarins ( psoralen , bergapten , and xanthotoxin ) in plants 87a-147-3 ( 406 micrograms/g ) , 87a-147-2 ( 292.9 micrograms/g ) , and the family 87a-338 ( 265.9 micrograms/g ) were 22.6 , 16.3 , and 14.8 times higher , respectively , than the concentration known to produce contact dermatitis ( 18 micrograms/g ) .
C0016859
furanocoumarins
C0025684
xanthotoxin