2-propylidene-19-nor-vitamin D compounds are disclosed as well as pharmaceutical uses for these compounds and methods of synthesizing these compounds. The present invention further relates to the use of superabsorbents for removing a metal-containing catalyst from a mixture after hydrolysis of the catalyst. The data registry maintains a link between the data record and a first source record and between the data record and a second source record. The size of the lug wrench can be minimized by folding the foldable arms and attaching the fourth detachable arm to the mounting member in the second position such that they are substantially parallel to the first arm. In such a configuration, after the cover member is previously assembled with the electric wire to form a cover-assembled wire, the cover-assembled wire is fit in the fitting-connection concave portion and simultaneously therewith the first connecting portion is connected to the electric wire side terminal. The WDMs 3 and 4 link to the PXCs 5 and 7 and release masking therebetween when the in-use system path is set, and set masking therebetween when the in-use system path is deleted.