Ponceau 4R

2611-82-7

sodium (E)-7-hydroxy-8-((4-sulfonatonaphthalen-1-yl)diazenyl)naphthalene-1,3-disulfonate

Acid Red 18; New Coccine

0.998

≥8.71 mg/mL in DMSO with ultrasonic; insoluble in EtOH; ≥64.2 mg/mL in H2O

OC1=C(/N=N/C2=C(C=CC=C3)C3=C(S(=O)(O[Na])=O)C=C2)C4=C(S(=O)(O[Na])=O)C=C(S(=O)(O[Na])=O)C=C4C=C1

C20H11N2Na3O10S3

604.46

Blue ice

Store at -20°C.