ound (XII) may be used as a commercial product as is, or may be produced by a commonly known method, a modification thereof, or the like. [0397] Of Compound (I???), Compound (Ib???), wherein R2 is a hydrogen atom, can also be produced by the method shown by Reaction Formula G below. [0398] With respect to the formula above, Xe is a leaving group. [0399] The ???leaving group??? represented by Xe is