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    threonine 1  threonine 2 threonine 4 threonine 3  threonine 5 threonine 6 threonine 7 threonine 8
     Oxygen Hydrogen Nitrogen Single Bonds Unused Double and Triple Bonds

    ribose 1 ribose 2 ribose 3 ribose 4 ribose 5 ribose 6 ribose 7 ribose 8 ribose 9 ribose 10 ribose 11 ribose 12 ribose 13