Proton

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The proton is observed to be stable, with a lower limit on its half-life of about 1035 years, although some theories predict that the proton may decay.
The proton is a baryon and is considered to be composed of two up quarks and one down quark.
If a proton is present on one of the oxygens, then this proton will be labelled O because of it's lower priority in the CIP rules due to the single bond instead of a double bond between C and O'.
The next spectrum is slightly more complex; Here three different protons all couple to one another (described as an ABX spin system), and the 2nI+1 rule must be applied in stages as follows; Each proton is described as a double doublet, since the two couplings involved are numerically different.
The Proton is used in both 3 and 4-stage versions, with the 3-stage version used for many of the Mir support missions.

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