L-dopa is used in the treatment of Parkinson€™s disease. Using the follwoing table, identify the four most acidic protons in the compound, and then arrange them in order of increasing acidity (two of the protons will be very similar in acidity and difficult to distinguish at this point in time):

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ACID pka CONJUGATE BASE Weakest Strongest acid for baso -0- -0- -7 -2.9 н "н -1.74 4.75 9.0 нн 9.9 н 15.7 Ay-00 16 18 н 19.2 H-CE 25 -CEC-H 38 н н н н Н н 44 н Н Н Woakest acid н н Н н Strongest base H-C-C -с-С-Н 50 Н н O EC I-C ОН NH2 Но ОН L-dopa