1-Naphthalenesulfonic acid, 5-(((2,4-bis(phosphonooxy)phenyl)methyl)amino)-, (3R-(3alpha,4abeta,5beta,6beta,6aalpha,10alpha,10abeta,10balpha))- 66731-46-2 Dipans N-(2,4-Diphosphobenzyl)-1-amino-5-naphthalenesulfonic acid