CID is 3903
synonyms found at PubChem are:
leucine enkephalin, Tyr-Gly-Gly-Phe-Leu, Leucine-enkephalin, YGGFL, URLZCHNOLZSCCA-UHFFFAOYSA-N, 2-[[2-[[2-[[2-[[2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylpentanoic acid, ENKEPHALIN, LEUCINE, CCRIS 6338, EINECS 261-457-1, NSC350588, NSC 350588, [Leu]-enkephalin, Leucine_Enkephalin, Spectrum_001429, AC1L1GYW, Spectrum2_001177, Spectrum3_001521, Spectrum4_001048, Spectrum5_000656, D06EES, D08ZCL, AC1Q1P3H, BSPBio_002902, KBioGR_001316, KBioSS_001909, N-(N-(N-(N-L-Tyrosylglycyl)glycyl)-L-phenylalanyl)-L-leucine, DivK1c_001010, SCHEMBL631958, SPBio_001193, GTPL1613, CHEBI:91634, CTK8G9358, HMS503I21, KBio1_001010, KBio2_001909, KBio2_004477, KBio2_007045, KBio3_002402, NINDS_001010, CCG-40269, NSC-350588, IDI1_001010, SMP1_000176, NCGC00178398-01, AN-39733, LS-96081, L000867, BRD-A32836748-001-01-1, 14-Amino-5-benzyl-15-(4-hydroxyphenyl)-2-isobutyl-4,10,13-tetraoxo-3,6,9,12-tetraazapentadecan-1-oic acid, 2-[[2-[[2-[[2-[[2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenyl-propanoyl]amino]-4-methyl-pentanoic acid