HP4
Bonds
| First atom | Second atom | Bond order type | Distance (experimental model) | Distance (ideal model) | Properties |
| O2 | P1 | doub | 1.55Å | 1.52Å | |
| P1 | O1 | sing | 1.55Å | 1.50Å | |
| P1 | H4 | sing | 1.42Å | 1.42Å | |
| P1 | H3 | sing | 1.42Å | 1.42Å |
Angles
| First atom | Second atom | Third atom | Angle (experimental model) | Angle (ideal model) |
| O2 | P1 | O1 | 114.4° | 109.5° |
| O2 | P1 | H4 | 108.2° | 109.5° |
| O2 | P1 | H3 | 108.2° | 109.5° |
| O1 | P1 | H4 | 108.2° | 109.5° |
| O1 | P1 | H3 | 108.2° | 109.5° |
| H4 | P1 | H3 | 109.5° | 109.4° |
Dihedrals
| First atom | Second atom | Third atom | Fourth atom | Torsion (experimental model) | Torsion (ideal model) |
| O2 | P1 | O1 | H4 | 120.7° | 120.0° |
| O2 | P1 | O1 | H3 | 120.7° | 120.0° |
| O2 | P1 | H4 | H3 | 117.8° | 120.0° |
| O1 | P1 | H4 | H3 | 117.7° | 120.0° |
