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It belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds. The systematic name is cholesteryl-β-D-glucoside glucohydrolase.
References
Kalinowska M, Wojciechowski ZA (1978). "Purification and some properties of steryl β-D-glucoside hydrolase from Sinapis alba seedlings". Phytochemistry. 17 (9): 1533–1537. doi:10.1016/S0031-9422(00)94637-5.