US 9,097,971 B2  95  96  -continued  -continued  [Chemical Formula 45]  (al-2-20)  Ra  ~  0  <  (al-2-21)  Ra  ~o  0  )--- 0  (al-2-22)  Ra  ~o  0  )  (al-2-23)  Ra  ~o  0  )--- 0  )  (al-2-24)  Ra  ~o  0  )  0  (al-3-3)  Ra  I  -i-CH~=r  0  0  0  (al-3-2)  Ra  I  -i-CH~=r  0  0  0  C;H;X)  (al-3-1)  Ra  I  -i-CH~=r  0  0  0  H;CX) 