These tools are for ordering antisense oligos (ASOs) between 15-35 nucleotides in length, for oligos outside this range use these links to order custom RNA or custom DNA.

  • Order individual ASOs

    Custom synthesis of 15-35 bases at either 0.05 μmol or 1.0 μmol scale, with the option of HPLC purification.

  • Order multiple ASOs

    Use this online tool to order multiple custom ASOs with the same characteristics (scale, purification and modifications).

Rely on Dharmacon’s 20+ years of oligo synthesis expertise for your ASO needs.

Our tool supports multiple modifications patterns to enhance the stability & binding affinity of the oligo, including phosphorothioate linkages, 2’-O-methyl, locked nucleic acids, and MOE (methoxyethyl) modifications. We also offer flexibility in synthesis scale and purification options to meet your experimental requirements.  Learn more about antisense oligos (ASOs) on our application page.

For more details on Revvity's continued compliance with the United States Framework For Nucleic Acid Synthesis Screening, please see our self-attestation.

We offer a wide selection of chemical modifications that can be applied to both siRNA and single-strand RNA. 

NOTE: Not all modifications are available through online ordering tool. For assistance please contact scientific support

Filter by:

  • siRNA
  • ssRNA
  • ssRNA-3'
  • ssRNA-Internal
  • ssRNA-5'
  • miRNA
  • SHOW ALL
Showing modifications available for:
  • siRNA
  • ssRNA
  • ssRNA-3'
  • ssRNA-Internal
  • ssRNA-5'
  • miRNA
  • All
Standard DNA Bases Short Code
2'-Deoxy Bases (A, C, G, T) A, C, G, T
2'-OMe RNA Bases (A, C, G, U) mA,mC,mG,mU
5' Modifications Short Code
5'-Cholesterol Chl
5'-Fluorescein Fl
Internal Modifications Short Code
Phosphorothioate *
2'-Fluoro-adenosine 2'-F-A
2'-Fluoro-cytidine 2'-F-C
2'-Fluoro-guanosine 2'-F-G
2'-Fluoro-uridine 2'-F-U
5-Methyl-Deoxycytidine 5-M-dC
Adenosine Locked Nucleic Acid
A-LNA
Cytidine (5-methyl-deoxy-cytidine) Locked Nucleic Acid 5mC-LNA
Guanosine Locked Nucleic Acid
G-LNA
Thymidine Locked Nucleic Acid
T-LNA
2′-O-Methoxy-ethyl-Adenosine
moeA
2’-O-Methoxy-ethyl-5-Methyl-Cytidine
moe5MeC
2′-O-Methoxy-ethyl-Guanosine
moeG
2’-O-Methoxy-ethyl-Thymidine moeT
3' Modifications Short Code
3'-Cholesterol 3'-Chl
N-acetyl-galactosamine
GalNAc
3’TEG-Cholesterol
TEG-Chl-3’