By googling the name, taken from the Formulary homepage, I got CAS# 2503-56-2. Great to know that Fotoimpex is selling the DVDs! Yes!
I gather it has this little name too: 4-Hydroxy-6-methyl[1,3,3a,7]tetrazaindene.
As for emulsion stabilizers, this thread seems to be a worthwhile read: http://www.apug.org/forums/forum205/...abliizers.html