For starters, what the hell is "Dichlorotriethylene glycol"? If it looks like http://www.dfmg.com.tw/member/chemical/cas/112-27-6.htm molecule, there are at least 6 different places you could have a chlorine. A combination of 2 chlorines at 6 possibles place would mean something like (6*5)/(2*1) = 15 different molecules with that generic name.