stereosensitive 3jph and 4jph phosphorus-proton coupling constants have been measured directly from the phosphorus-31 nuclear magnetic resonance ( nmr ) spectra of a variety of adenine , thymine , and uracil 3'-mononucleotides , 5'-mononucleotides , their cyclic analogues , and the corresponding dinucleotides , under various conditions of ph and temperature .
C0040087
thymine
C0041917
uracil