Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕdemptūra, ae, f. [redimo], an undertaking of public deliverings by contract, a contracting, farming (very rare): qui redempturis auxissent patrimonia, Liv. 23, 48 fin.: redempturis faciendis, Dig. 14, 3, 5; cf. Becker, Antiq. 2, 1, p. 270, and 3, 2, p. 217.