Oligonucleotide Molecular Weight Calculator Enter Sequence (e.g., /5AmMC6/ T* G +C [PEG6] A* [T-C6-amino] [3-amino]): 5′ Modification: None /5_Hexynyl/ (+160.1 Da) /5AmMC6/ (+179.2 Da) 3′ Modification: None /3BHQ_2/ (+556.5 Da) /3-amino/ (+179.15 Da) Calculate Available internal modifications: [PEG6], [T-C6-amino]