Talk:Bromocresol purple

Question
I'm not sure, how does the structure of bromcresol purple look like. I found two different structures. The first one in Merck catalogue (currently used) and the second one here: http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=219970. Is it an isomer or uncertainity in real structure of that molecule? Tomaxer 09:28, 14 April 2007 (UTC)
 * One is the low pH form, the other is the high pH form - now explained in the article. EdChem (talk) 04:40, 9 July 2016 (UTC)