80  US 8,298,748 B2  79  -continued  -continued  (al-3-20)  Ra  I  ~CH~=r  0  0~  0  (al-3-24)  Ra  I  ~CH~=r  0  0~  0  [Chemical Formula 44]  (al-3-21)  Ra  I  ~CH~=r  0  ~o  0  (al-3-25)  Ra  I  ~CH~=r  0  )  0  0~  0  l)  (al-3-26)  Ra  I  ~CH~=r  0  )  0  0~  0  (al-3-23)  Ra  I  -+CH~=r  0  0~  0  (al-3-22)  Ra  I  ~CH~=r  0  ~o  0 