2-Propyn-1,1,3-d3-1-ol is used in the preparation of deuterated oxybutynins as muscarinic acetylcholine receptor modulators; Also, it is an intermediate used in the synthesis of rac Fosfomycin-D5 (Major) Benzylamine Salt (F727503), which is the deuterium labelled analogue of Fosfomycin antibiotic. Related to Fosfomycin Disodium Salt (F727500), rac Fosfomycin-13C3 Benzylamine Salt (F727502), Fosfomycin Tromethamine (F727505), and Fosfomycin Calcium (F727508).