A 2-amino-2-(2-(substituted) ethyl) propane-1, 3-diol compound wherein said substituent is selected from the group consisting of 4-formylphenyl and 4-(1-hydroxy-5-phenylpentyl) phenyl) useful as an intermediate in the preparation of a 2-aminopropane-1, 3-diol compound of the formula 1548 א' בתמוז התשס" ד - June 20, 2004 wherein R1, R2, R3 and R4 are the same or different and each is a hydrogen or an acyl; a pharmaceutically acceptable acid addition salt thereof or a hydrate thereof.
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