Abstract: A compound of formula I, or a pharmaceutically acceptable salt thereof, wherein —X1, X2 and X3 are each independently where Y is an alkylene, alkenylene or alkynylene group, each of which may be optionally substituted with one or more substituents selected from alkyl, halo, CF3, OH, alkoxy, NH2, CN, NO2 and COOH; W is absent or is O, S or NH; R1, R2, R3 and R4 are each independently selected from H, alkyl, aryl and a protecting group Pi; R7, R8 and R9 are each independently selected from H, alkyl, halo, CF3, OH, alkoxy, CN, NO2 and COOH; —q is 1, 2, 3 or 4; q? is 0, 1, 2 or 3, where q+q? equals 4; p and r are each independently 1, 2, 3, 4 or 5; p? and r? are each independently 0, 1, 2, 3 or 4, where p+p? and r+r? each equal 5; and —n is 0, 1, 2, 3, 4, 5 or 6.

Abstract: The present invention relates to a leg covering for protecting the lower portion of a user's leg comprising: a mesh body, where said mesh body includes a plurality of openings; a center opening, where said center opening provides a means for the insertion of a user's leg; and a mechanism to secure the covering to the user's leg. The body of the leg covering may be substantially cylindrical in shape. In one exemplary embodiment, the mechanism to secure includes at least one strap where the strap includes a Velcro tip. In another exemplary embodiment, the mechanism to secure includes two straps where each strap includes a Velcro tip.