melanotan ii synthetic tanning drug molecule. 3d rendering. not approved as drug. atoms are represented as spheres with

melanotan melanocortin peptide melanotane alphamelanocyte melanocyte stimulating hormone msh melanogenesis tanning aphrodisiac lactam melanin tan sunless alpha melanoma erectile dysfunction erection mt2 bremelanotide hydrogen carbon nitrogen oxygen molecule atoms atomic model molecular compound composition chemical chemistry bond structure formula 3d rendering illustration