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Elastatinal1) is an elastase inhibitor which was found in culture filtrates of various species of actinomycetes. In this communication, its structural elucidation is reported. The properties of elastatinal have already been described in a previous papery. It has the molecular formula C21H36N8O7. The IR [1725. 1655 (broad) and 1550 (broad) cm-1] and UV [2 0.1N HCl max: 275 nm (E 1% 1cm, 1.5)] spectra, color reactions (RYDON-SMITH, FOLIN, trl-

The structure of elastatinal, an elastase inhibitor of microbial origin.