Structure based on 2rgu

Ideal structure
Name: 8-[(3r)-3-aminopiperidin-1-yl]-7-but-2-yn-1-yl-3-methyl-1-[(4-methylquinazolin-2-yl)methyl]-3,7-dihydro-1h-purine-2,6-dione
Formula: C25 H28 N8 O2
Weight: 472.542
SMILES: "CC#CCn1c(nc2N(C)C(=O)N(Cc3nc(C)c4ccccc4n3)C(=O)c12)N5CCC[CH](N)C5"
Spacial conformation based on PDB 2rgu.
Also present on 6y0f
RESIDUE   356     63
CONECT      C1     3 N2   C3   C4  
CONECT      N2     3 C1   C5   C6  
CONECT      C3     3 C1   N7   N8  
CONECT      C4     3 C1   N9   O10 
CONECT      C5     3 N2   N7   N11 
CONECT      C6     4 N2   C12  H61  H62 
CONECT      N7     2 C3   C5  
CONECT      N8     3 C3   C13  C14 
CONECT      N9     3 C4   C13  C15 
CONECT      O10    1 C4  
CONECT      N11    3 C5   C16  C17 
CONECT      C12    2 C6   C18 
CONECT      C13    3 N8   N9   O19 
CONECT      C14    4 N8   H141 H142 H143
CONECT      C15    4 N9   C20  H151 H152
CONECT      C16    4 N11  C21  H161 H162
CONECT      C17    4 N11  C22  H171 H172
CONECT      C18    2 C12  C23 
CONECT      O19    1 C13 
CONECT      C20    3 C15  N24  N25 
CONECT      C21    4 C16  C26  N27  H21 
CONECT      C22    4 C17  C26  H221 H222
CONECT      C23    4 C18  H231 H232 H233
CONECT      N24    2 C20  C28 
CONECT      N25    2 C20  C29 
CONECT      C26    4 C21  C22  H261 H262
CONECT      N27    3 C21  H271 H272
CONECT      C28    3 N24  C30  C31 
CONECT      C29    3 N25  C30  C32 
CONECT      C30    3 C28  C29  C33 
CONECT      C31    3 C28  C34  H31 
CONECT      C32    4 C29  H321 H322 H323
CONECT      C33    3 C30  C35  H33 
CONECT      C34    3 C31  C35  H34 
CONECT      C35    3 C33  C34  H35 
CONECT      H61    1 C6  
CONECT      H62    1 C6  
CONECT      H141   1 C14 
CONECT      H142   1 C14 
CONECT      H143   1 C14 
CONECT      H151   1 C15 
CONECT      H152   1 C15 
CONECT      H161   1 C16 
CONECT      H162   1 C16 
CONECT      H171   1 C17 
CONECT      H172   1 C17 
CONECT      H21    1 C21 
CONECT      H221   1 C22 
CONECT      H222   1 C22 
CONECT      H231   1 C23 
CONECT      H232   1 C23 
CONECT      H233   1 C23 
CONECT      H261   1 C26 
CONECT      H262   1 C26 
CONECT      H271   1 N27 
CONECT      H272   1 N27 
CONECT      H31    1 C31 
CONECT      H321   1 C32 
CONECT      H322   1 C32 
CONECT      H323   1 C32 
CONECT      H33    1 C33 
CONECT      H34    1 C34 
CONECT      H35    1 C35 
END   
HET    356             63
HETSYN     356 Linagliptin
HETNAM     356 8-[(3R)-3-Aminopiperidin-1-yl]-7-but-2-yn-1-yl-3-methyl
HETNAM   2 356 -1-[(4-methylquinazolin-2-yl)methyl]-3,7-dihydro-1H-pur
HETNAM   3 356 ine-2,6-d ione
FORMUL      356    C25 H28 N8 O2

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