Table 3: Hydrogen-bond geometry of (I) (Å, °).

D–H···AD–HHADA<(D–HA)

N1–H1NO2i0.891.972.847 (2)166 (2)
N1–H2NO2ii0.901.842.738 (2)174 (2)
N1–H3NO3iii0.912.183.020 (2)154 (2)
N2–H4NO3iv0.871.812.685 (3)174 (3)
N3–H5NO4iii0.851.882.712 (3)164 (3)
N3–H5NO5v0.852.593.019 (3)112 (2)
C5–H5 O1vi0.932.413.052 (2)126 (2)
C6–H6O5v0.932.362.931 (3)119 (2)

i , , ; ii , , ; iii , , ; iv , , ; v , , ; vi , , .