2,7-Naphthalenedisulfonic acid, 5-(((5(or 6)-((2-chloroethyl)sulfonyl)bicyclo(2.2.1)hept-2-en-2-yl)carbonyl)amino)-4-hydroxy-3-((1-sulfo-2-naphthalenyl)azo)- 5-(((5(6)-(2-Chloroethylsulfonyl)bicyclo(2.2.1)hept-2-ene-2-yl)carbonyl)amino)-4-hydroxy-3-((1-sulfonaphth-2-yl)azo)-2,7-naphthalenedisulfonic acid 68156-18-3