Subclass | Zn1 Geometry | Zn1 Ligands | Zn2 Geometry | Zn2 Ligands |
B1 | Tetrahedral | H116, H118, H196 & uW1 | Trigonal bipyramidal | D120, C221, H263 & uW1 |
B2 | Not occupied |
| Tetrahedral | D120, C221, H263 & uW1 |
B3 | Tetrahedral | H116, H118, H196 & uW1 | Trigonal bipyramidal | D120, C221, H263, uW1 & W2 |
B4 | Tetrahedral | H116, R118, H196 | Trigonal bipyramidal | D120, Q121?S221, A262 |