I got a "D" in chemistry in college. My idiot advisor suggested I take it again the next semester so that my second grade would replace the first for my gpa calculation. I got an "F" the second time around. Needless to say, my chemistry book had the misfortune of replacing a target for expansion testing .223 hollow points. I am now a lawyer in California - shows what state school advisors know.
Basically, that is a long winded way of saying I don't know what the hell all of that OH and ethanol and amine crap is.
All I know is that I use SM-90 in a modified DWC with every single res change. It works just like Hydrogen peroxide, without the burning foaming death that Hydrogen peroxide brings.
The first time I used SM-90, I noticed a near instant (<24 hrs) increase in the health of my roots. It eliminated some of the little flying bastards that were camped out around the base of the plant as well as dead roots.
In addition to SM-90, I use FloraNova (bloom & grow - depending), Floralicious bloom, calmag +, pro-tekt silica, and once or twice during flowering Liquid KoolBloom.
I have never noticed an adverse reaction, either in smell, feel, pH, or overall look of the plants or roots with any combination of the above nutes with SM-90.