Sodium percarbonate, sometimes abbreviated as SPC, is a chemical, an adduct of sodium carbonate and hydrogen peroxide (a perhydrate), with formula
2Na2CO3.3H2O2.
S 2230 (OTTO) Sodium pentacarbonate Cas 15630-89-4 - used in organic synthesis as a convenient source of anhydrous H2O2, in particular in solvents that cannot dissolve the carbonate but can leach the H2O2 out of it.