afamelanotide melanotan-1 photoprotective drug molecule. skeletal formula.

afamelanotide melanotan1 photoprotective drug molecule skeletal formula afamelanotid melanotan melanocortin peptide hormone alpha melanocyte stimulating msh skin pigmentation melanogenesis sun damage uv ultraviolet cancer photosensitivity erythropoietic protoporphyria epp vitiligo counterfeit photoprotection hydrogen carbon nitrogen oxygen atoms atomic molecular compound composition chemical chemistry structure line drawing flat icon vector