Behentrimonium methosulfate is a cationic quaternary ammonium salt derived from rapeseed oil (the plant for canola oil). By putting it in salt form, it will dissolve in water, so we can access the condition-y goodness for our hair. The cationic part means it’s positively charged, so it will stick to the negatively charged sections of your hair. It has a long carbon chain – 22 carbons, hence the prefix behe- and it will adsorb to your hair to condition it.
You can find it in Incroquat BTMS-50 or Rita BTMS-225.