text: <unk>   (also (S)-ketamine or S(+)-ketamine) (brand name Ketanest S) is a general anaesthetic and a dissociative. It is the S(+) enantiomer of the drug ketamine, a general anaesthetic.<unk>  acts primarily as a non-competitive NMDA receptor antagonist, but is also a dopamine reuptake inhibitor. As of July 2014, it is in phase II clinical trials for treatment-resistant depression (TRD).
option_0: Esketamine
option_1: Ketamine
option_2: Meperidine 
option_3: Phenazocine
option_4: Naloxone
option_5: Pentazocine
option_6: Remifentanil
option_7: Fentanyl 