83966-27-2 Apa-orn-dns L-Ornithine, N2-(4-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzoyl)-N5-((5-(dimethylamino)-1-naphthalenyl)sulfonyl)- N-alpha-(4-Amino-4-deoxy-N(10)-methylpteroyl)-N(delta)-(5-(N,N-dimethylamino)-1-naphthalenesulfonyl)ornithine