Modomics - A Database of RNA Modifications


Full nameN(4)-acetylcytidine-5'-monophosphate
IUPAC name[(2R,3S,4R,5R)-5-(4-acetamido-2-oxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methyl phosphate
Short namepac4C
MODOMICS code42551C
N(4)-acetylcytidine 5'-monophosphate(2-)
N(4)-acetylcytidine 5'-phosphate

Nature of the modified residueNatural
Residue unique ID200
Found in RNAYes
Related nucleosides81
RCSB ligands


Chemical information

Sum formulaC11H14N3O9P
Type of moietynucleotide
Degeneracynot aplicable
Number of atoms24
Number of Hydrogen Bond Acceptors 1 (HBA1)9
Number of Hydrogen Bond Acceptors 2 (HBA2)12
Number of Hydrogen Bond Donors (HBD)3
Search the molecule in external databases ChEMBL  ChemAgora  ChEBI  PubChem Compound Database  Ligand Expo  ChemSpider  WIPO 
PubChem CID
PubChem SIDs

* Chemical properties calculated with Open Babel - O'Boyle et al. Open Babel: An open chemical toolbox. J Cheminform 3, 33 (2011) (link)

Download Structures

2D   .png .mol .mol2 .sdf .pdb .smi
3D   .mol .mol2 .sdf .pdb


Tautomers SMILES
CC(N=c1[nH]c(=O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)=O tautomer #0
CC(Nc1nc(=O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)=O tautomer #1
C=C(N=c1[nH]c(=O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)O tautomer #2
C=C(Nc1nc(=O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)O tautomer #3
CC(N=c1nc(O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)=O tautomer #4
CC(=Nc1nc(=O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)O tautomer #5
C=C(N=c1nc(O)n(C2C(O)C(O)C(COP(=O)([O-])[O-])O2)cc1)O tautomer #6

Tautomer image Show Image

Predicted CYP Metabolic Sites

pac4C pac4C pac4C

* CYP Metabolic sites predicted with SMARTCyp. SMARTCyp is a method for prediction of which sites in a molecule that are most liable to metabolism by Cytochrome P450. It has been shown to be applicable to metabolism by the isoforms 1A2, 2A6, 2B6, 2C8, 2C19, 2E1, and 3A4 (CYP3A4), and specific models for the isoform 2C9 (CYP2C9) and isoform 2D6 (CYP2D6). CYP3A4, CYP2D6, and CYP2C9 are the three of the most important enzymes in drug metabolism since they are involved in the metabolism of more than half of the drugs used today. The three top-ranked atoms are highlighted. See: SmartCYP and SmartCYP - background; Patrik Rydberg, David E. Gloriam, Lars Olsen, The SMARTCyp cytochrome P450 metabolism prediction server, Bioinformatics, Volume 26, Issue 23, 1 December 2010, Pages 2988–2989 (link)

LC-MS Information

Monoisotopic massNone
Average mass363.217
[M+H]+ not available
Product ions not available
Normalized LC elution time * not available
LC elution order/characteristics not available

* normalized to guanosine (G), measured with a RP C-18 column with acetonitrile/ammonium acetate as mobile phase.

Last modification of this entry: Sept. 29, 2021

Copyright © Genesilico - All rights reserved
If you have any advice or suggestions for corrections or improvements, please contact: Andrea Cappannini - lp.vog.bcmii@ininnappaca