S is a well known pain killer which of the following is 'R'?

1.	S is a well known pain killer which of the following is 'R'?
Answer» `CH_(3)Coverset(O)OVERSET(\|\|)C-NH_(2)` `CH-(3)-overset(O)overset(II)C-O-Coverset(O)overset(\|\|)C-CH_(3)` `CH_(3)-overset(O)overset(\|\|)C-H` `CH_(3)-overset(O)overset(\|\|)CH_(3)` SOLUTION :N//A

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