. . "wherein R1, R2, R3 are independently hydrogen, an optionally substituted or unsubstituted alkyl, a heteroalkyl, an aryl, a heteroaryl, a fused carbocycle or a fused heterocycle group, and wherein independently R4 and R5 are a halogen, hydrogen, an optionally substituted or unsubstituted alkyl, a heteroalkyl, an aryl, a heteroaryl, a fused carbocycle or fused heterocycle, or, together with the boro" . . .