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2-methyl-2-(4-oxetan-3-yl-piperazin-1-yl)-propionaldehyde; CAS No.: 1575591-71-7; This oxetane-containing piperazine aldehyde demonstrates our expertise in polarity-modifying building blocks. The spirocyclic oxetane enhances aqueous solubility while the aldehyde group enables click chemistry applications. As a worldwide chemical supplier, we provide custom PEGylation services using such aldehydes for protein-drug conjugate optimization.