The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/by/3.0/). For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.
A ring assembly consisting of two 5-amino-4-hydroxy-3-[(2-methoxyphenyl)diazenyl]naphthalene-2,7-disulfonic acid units joined by a 4,4'-linkage. The tetrasodium salt is the histological dye 'Pontamine sky blue 5B'.
C.I. Direct Blue 15 (acid form); C.I. Direct Blue 15 free acid; Formula=C34H28N6O16S4; InChI=1S/C34H28N6O16S4/c1-55-25-9-15(3-5-23(25)37-39-31-27(59(49,50)51)11-17-7-19(57(43,44)45)13-21(35)29(17)33(31)41)16-4-6-24(26(10-16)56-2)38-40-32-28(60(52,53)54)12-18-8-20(58(46,47)48)14-22(36)30(18)34(32)42/h3-14,41-42H,35-36H2,1-2H3,(H,43,44,45)(H,46,47,48)(H,49,50,51)(H,52,53,54)/b39-37+,40-38+; InChIKey=KIZIRROTJQVUGJ-HVMBLDELSA-N; Pontamine sky blue 5B free acid; SMILES=C12=C(C=C(C(=C1O)/N=N/C3=CC=C(C=C3OC)C4=CC(=C(C=C4)/N=N/C5=C(C=C6C(=C5O)C(=CC(=C6)S(O)(=O)=O)N)S(O)(=O)=O)OC)S(O)(=O)=O)C=C(C=C2N)S(O)(=O)=O