smiles:CCCCCCCCCCCCCCC(=O)OCCC

Same atoms, joined differently. Every one of these is a separate compound with its own boiling point, smell and reactions. These are the ones PubChem has on file, which for a larger formula is fewer than the number that could exist on paper.

• Stearic Acid
• Ethyl palmitate
• 16-Methylheptadecanoic Acid
• Cetyl Acetate
• Hexyl Laurate
• Isobutyl Myristate
• Butyl Myristate
• Methyl margarate
• Tridecyl Neopentanoate
• Hexanoic acid, 3,5,5-trimethyl-, 3,5,5-trimethylhexyl ester
• 2-Propylheptyl octanoate
• 7-Methyloctyl 7-methyloctanoate
• Isohexyl Laurate
• Decanoic acid, 2-octyl-
• Octyl caprate
• 2-Ethylhexyl caprate
• Methyl 14-methylhexadecanoate
• Isodecyl 2-ethylhexanoate
• 15-Methylheptadecanoic acid
• (9Z)-octadec-9-ene-1,18-diol
• Dodecyl hexanoate
• Propyl pentadecanoate
• Decyl octanoate
• Methyl 2-methylhexadecanoate
• Methyl 15-methylhexadecanoate
• 2-Hexyldodecanoic acid
• Decyl 2-ethylhexanoate
• 8-(3-Octyl-2-oxiranyl)-1-octanol
• Tetradecyl butyrate
• Nonanoic acid, nonyl ester
• Tetradecyl isobutyrate
• Hexadecanoic acid, 2-ethyl-
• Dodecanoic acid, 1-methylpentyl ester
• Heptadecanoic acid, 2-methyl-
• 10-Methylheptadecanoic acid
• i-Propyl 12-methyltetradecanoate
• Acetic acid, di-n-heptyl-, ethyl ester
• Isostearic Acid (=2,2,4,8,10,10-Hexamethylundecane-5-carboxylic Acid)
• (Z)-9-Octadecene-1,12-diol
• 14-Methylheptadecanoic acid
• 12,15-Dimethyhexadecanoic acid
• 10,15-Dimethylhexadecanoic acid
• 10-Hydroxyoctadecan-9-one
• Hexadecan-2-yl acetate
• 2-Pentadecyl-1,3-dioxolane
• Heptadecyl formate
• 2-Heptylundecanoic acid
• 1-Hydroxyoctadecan-3-one