Selected geometric (Å) parameters for 4d and 4p.

Parameter	4d	4p
N1–N2	1.3838(13)	1.3838(13)
C4–O4	1.2277(14)	1.2226(18)
C7a–N1	1.3337(14)	1.338(2)
C3–N2	1.3284(14)	1.3309(19)
C4–N5	1.4238(14)	1.431(2)
C6–N5	1.3660(14)	1.3718(19)
C6–N7	1.3006(14)	1.304(2)
C7a–N7	1.3734(14)	1.370(2)
C3–C3a	1.4256(15)	1.420(2)
C3a–C4	1.4187(15)	1.426(2)
C3a–C7a	1.3877(15)	1.388(2)