P¹- (5'- [2'- / 3'- O- (6- (6- [Biotinyl]aminohexanoyl)aminohexylcarbamoyl)adenosyl])- P⁴- (5'- adenosyl)- tetraphosphate ( 2'/3'-Biotin-16-Ap₄A / 2'/3'-Biotin-16-AppppA ), sodium salt
P¹- (5'- [1, N⁶- Ethenoadenosyl])- P⁴- (5'- [1, N⁶- ethenoadenosyl])- tetraphosphate ( ε-Ap₄-ε-A / ε-Apppp-ε-A ), sodium salt
P¹- (5'- [1, N⁶- Ethenoadenosyl])- P⁴- (5'- uridyl)- tetraphosphate ( ε-Ap₄U / ε-AppppU / ε-Up₄A)