149017-67-4 L-Ornithine, N5-(imino(methylamino)methyl)-, bis(4-((4-hydroxyphenyl)azo)benzenesulfonate) MA(Hbs) Monomethylarginine di-(4-hydroxyazobenzene-4'-sulfonate) N5-(Imino(methylamino)methyl)-L-ornithine bis(4-((4-hydroxyphenyl)azo)benzenesulfonate)