PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2871191-5 1986 The MTX analogues were obtained by reaction of 4-amino-4-deoxy-N10-methylpteroic acid (mAPA) and N omega-Boc-alpha,omega-diaminoalkanoic acids in the presence of diethyl phosphorocyanidate, followed by deprotection with trifluoroacetic acid (TFA) or by reaction of p-nitrophenyl-mAPA and N omega-Boc-alpha,omega-diaminoalkanoic acids and subsequent treatment with TFA. diethylphosphorocyanidate 162-188 glutamyl aminopeptidase Mus musculus 87-91