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C 4212 (OTTO) 3-Chloropropionaldehydediethylacetal, 95%+ Cas 35573-93-4 - used in the synthesis of N-[4-[[3-(2, 4-diamino-1,6-dihydro-6-oxo-5-pyrimidinyl)propyl]amino]benzoyl]-L-glutamic acid, an acyclic analog of 5,6,7,8-tetrahydrofolic acid.