The A18Famide is an organic compound with the formula C₈₉H₁₃₀N₂₄O₂₄. The systematic name of this chemical is L-Phenylalaninamide, L-alanylglycyl-L-alpha-glutamylglycyl-L-leucyl-L-seryl-l-seryl-L-prolyl-L-phenylalanyl-L-tryptophyl-L-seryl-L-leucyl-L-alanyl-L-alanyl-L-prolyl-L-glutaminyl-L-arginyl-. With the CAS registry number 99588-52-0, it is also named as A18Fa. Besides, it should be stored in a closed cool and dry place. It is an endogenous mammalian FMRFamide (Phe-Met-Arg-Phe-NH₂)-related octadecapeptide, it is also an orphan G-protein coupled receptor peptide and a morphine-modulating neuropeptide.

You can still convert the following datas into molecular structure:
(1)SMILES: CC(C)CC(C(=O)NC(CO)C(=O)NC(CO)C(=O)N1CCCC1C(=O)NC(Cc2ccccc2)C(=O)NC(Cc3c[nH]c4c3cccc4)C(=O)NC(CO)C(=O)NC(CC(C)C)C(=O)NC(C)C(=O)NC(C)C(=O)N5CCCC5C(=O)NC(CCC(=O)N)C(=O)NC(CCCNC(=N)N)C(=O)NC(Cc6ccccc6)C(=O)N)NC(=O)CNC(=O)C(CCC(=O)O)NC(=O)CNC(=O)C(C)N
(2)InChI: InChI=1/C89H130N24O24/c1-46(2)35-60(102-71(119)42-98-76(125)57(29-31-72(120)121)101-70(118)41-97-74(123)48(5)90)80(129)109-65(44-115)84(133)111-66(45-116)88(137)113-34-18-27-68(113)86(135)108-62(38-52-21-12-9-13-22-52)81(130)107-63(39-53-40-96-55-24-15-14-23-54(53)55)82(131)110-64(43-114)83(132)106-61(36-47(3)4)79(128)99-49(6)75(124)100-50(7)87(136)112-33-17-26-67(112)85(134)104-58(28-30-69(91)117)78(127)103-56(25-16-32-95-89(93)94)77(126)105-59(73(92)122)37-51-19-10-8-11-20-51/h8-15,19-24,40,46-50,56-68,96,114-116H,16-18,25-39,41-45,90H2,1-7H3,(H2,91,117)(H2,92,122)(H,97,123)(H,98,125)(H,99,128)(H,100,124)(H,101,118)(H,102,119)(H,103,127)(H,104,134)(H,105,126)(H,106,132)(H,107,130)(H,108,135)(H,109,129)(H,110,131)(H,111,133)(H,120,121)(H4,93,94,95)
(3)InChIKey: GNNFMZHECHAEGF-UHFFFAOYAI
(4)Std. InChI: InChI=1S/C89H130N24O24/c1-46(2)35-60(102-71(119)42-98-76(125)57(29-31-72(120)121)101-70(118)41-97-74(123)48(5)90)80(129)109-65(44-115)84(133)111-66(45-116)88(137)113-34-18-27-68(113)86(135)108-62(38-52-21-12-9-13-22-52)81(130)107-63(39-53-40-96-55-24-15-14-23-54(53)55)82(131)110-64(43-114)83(132)106-61(36-47(3)4)79(128)99-49(6)75(124)100-50(7)87(136)112-33-17-26-67(112)85(134)104-58(28-30-69(91)117)78(127)103-56(25-16-32-95-89(93)94)77(126)105-59(73(92)122)37-51-19-10-8-11-20-51/h8-15,19-24,40,46-50,56-68,96,114-116H,16-18,25-39,41-45,90H2,1-7H3,(H2,91,117)(H2,92,122)(H,97,123)(H,98,125)(H,99,128)(H,100,124)(H,101,118)(H,102,119)(H,103,127)(H,104,134)(H,105,126)(H,106,132)(H,107,130)(H,108,135)(H,109,129)(H,110,131)(H,111,133)(H,120,121)(H4,93,94,95)
(5)Std. InChIKey: GNNFMZHECHAEGF-UHFFFAOYSA-N