Structure based on ?

Ideal structure
Name: bis-1,2-{[(z)-2carboxy-2-methyl-1,3-dioxane]-5-yloxycarbonyl}-piperazine
Formula: C18 H26 N2 O12
Weight: 462.405
SMILES: "C[C]1(OC[CH](CO1)OC(=O)N2CCN(CC2)C(=O)O[CH]3CO[C](C)(OC3)C(O)=O)C(O)=O"
Spacial conformation based on PDB ?.
Also present on 2a3x
RESIDUE   CPK     58
CONECT      O30    2 C29  H30 
CONECT      C29    3 O30  O31  C26 
CONECT      O31    1 C29 
CONECT      C26    4 C29  O27  C32  O25 
CONECT      O27    2 C26  C28 
CONECT      C28    4 O27  C23  H281 H282
CONECT      C32    4 C26  H321 H322 H323
CONECT      O25    2 C26  C24 
CONECT      C24    4 O25  C23  H241 H242
CONECT      C23    4 C28  C24  O22  H23 
CONECT      O22    2 C23  C20 
CONECT      C20    3 O22  O21  N17 
CONECT      O21    1 C20 
CONECT      N17    3 C20  C16  C18 
CONECT      C16    4 N17  C15  H161 H162
CONECT      C15    4 C16  N14  H151 H152
CONECT      C18    4 N17  C19  H181 H182
CONECT      C19    4 C18  N14  H191 H192
CONECT      N14    3 C15  C19  C12 
CONECT      C12    3 N14  O13  O11 
CONECT      O13    1 C12 
CONECT      O11    2 C12  C3  
CONECT      C3     4 O11  C2   C4   H3  
CONECT      C2     4 C3   O1   H21  H22 
CONECT      O1     2 C2   C6  
CONECT      C4     4 C3   O5   H41  H42 
CONECT      O5     2 C4   C6  
CONECT      C6     4 O1   O5   C10  C7  
CONECT      C10    4 C6   H101 H102 H103
CONECT      C7     3 C6   O8   O9  
CONECT      O8     1 C7  
CONECT      O9     2 C7   HO9 
CONECT      H30    1 O30 
CONECT      H281   1 C28 
CONECT      H282   1 C28 
CONECT      H321   1 C32 
CONECT      H322   1 C32 
CONECT      H323   1 C32 
CONECT      H241   1 C24 
CONECT      H242   1 C24 
CONECT      H23    1 C23 
CONECT      H161   1 C16 
CONECT      H162   1 C16 
CONECT      H151   1 C15 
CONECT      H152   1 C15 
CONECT      H181   1 C18 
CONECT      H182   1 C18 
CONECT      H191   1 C19 
CONECT      H192   1 C19 
CONECT      H3     1 C3  
CONECT      H21    1 C2  
CONECT      H22    1 C2  
CONECT      H41    1 C4  
CONECT      H42    1 C4  
CONECT      H101   1 C10 
CONECT      H102   1 C10 
CONECT      H103   1 C10 
CONECT      HO9    1 O9  
END   
HET    CPK             58
HETNAM     CPK BIS-1,2-{[(Z)-2CARBOXY-2-METHYL-1,3-DIOXANE]-5-YLOXYCAR
HETNAM   2 CPK BONYL}-PIPERAZINE
FORMUL      CPK    C18 H26 N2 O12

This OCA MONOMER page
uses Jmol, developed by the Jmol Development Team (color reference)
OCA© by Jaime Prilusky, 1996-2004,2006,2010,2014
Bioinformatics Unit
Weizmann Institute of Science