vanillin Search Term: vanillinSource Category: ASSISTVanillin is on the Recommended Chemicals list for Australian schools. Synonyms: 4-hydroxy-m-anisaldehyde, p-hydroxy-m-methoxybenzaldehyde, vanillic aldehyde; CAS Number: 121-33-5; Signal Word: Warning. Tags: 121-33-54-hydroxy-m-anisaldehydep-hydroxy-m-methoxybenzaldehydevanillic aldehyde