There are two different CAS entries for CD-3, and both differ a bit, there is 25646-71-3 which is the one used on most products iirc, and there is also 24567-76-8.
For 25646-71-3 the data on different chemical website databases vary for that exact same CAS number and the molecular weight varies between 200 something g/mol to 800 something g/mol depending on which site you're on, so it can be annoying. Both 24-567-76-8 should be the 800 something version with a lot more sulphuric acid attached to it.
Thanks. I read many times but I didn´t understand quite well. Which one should I use? 25646-71-3 or 24567-76-8?