What type of drug is Oxandrolone that was found in the system of  Cinthya Domínguez in 2015?
Cinthya Domínguez Cinthya Domínguez (born 1982-10-29) is a female weightlifter from Mexico. She won the silver medal at the 2007 Pan American Games for her native North American country in the – 69 kg weight division. In 2015 Domínguez was suspended after she failed a drug test (found trace of Oxandrolone).
Difelikefalin Difelikefalin (INN) (developmental code names CR845, FE-202845), also known as -Phe--Phe--Leu--Lys-[γ-(4-N-piperidinyl)amino carboxylic acid] (as the acetate salt), is an analgesic opioid peptide acting as a peripherally specific, highly selective agonist of the κ-opioid receptor (KOR). It is under development by Cara Therapeutics as an intravenous agent for the treatment of postoperative pain. An oral formulation has also been developed. Due to its peripheral selectivity, difelikefalin lacks the central side effects like sedation, dysphoria, and hallucinations of previous KOR-acting analgesics such as pentazocine and phenazocine. In addition to use as an analgesic, difelikefalin is also being investigated for the treatment of pruritus (itching). Difelikefalin has completed phase II clinical trials for postoperative pain and has demonstrated significant and "robust" clinical efficacy, along with being safe and well-tolerated. It is also in phase II clinical trials for uremic pruritus in hemodialysis patients.