Sub Group: Standards - 13C & 2H for GC-Mass Spectrometry Catalog Number: D2238 Enrichment: 99%D CAS Number: 74495-70-8 Molecular Weight: 201.19 Synonyms: DL-4-Hydroxy-3-methoxy-D3-mandelic Acid, Vanillylmandelic acid, VMA, Vanillyl mandelic acid