the sensitivity of human colorectal cancer to 5-fluorouracil ( 5-fu ) and its derivatives : 1- ( tetrahydro-2-furyl ) -5-fu ( tegafur ) and 1-hexylcarbamoyl-5-fu ( hcfu ) was determined by in vitro succinate dehydrogenase inhibition ( sdi ) test and in vivo subrenal capsule ( src ) assay .
C0016778
tegafur
C0016360
fu