MK-677 has gone under the following names, Ibutamoren, MK-677, MK-0677, LUM-201, L-163,191; former tentative brand name Oratrope. All are the exact same formulation (C27H36N4O5S). All are non-peptide agonist of the ghrelin receptor and a growth hormone secretagogue, mimicking the growth hormone (GH)-stimulating action of the endogenous hormone ghrelin. If you are sensitive to ghrelin you are going to get hungry.