Common names of organic compounds vs. their chemical names

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Two strokes: Ferrocene; Dicyclopentadienyliron, Fe2
Three strokes: Sorbic acid; Hexadiene-dioic acid – CH3CH=CHCH=CHCOOH; Maleic anhydride; Maleic acid – HOOCCH=CHCOOH
Four strokes: Piperidine; Azacyclohexane – NH-(CH2)5; Pyroxylin; Nitrocellulose (11–12% N); Aspartic acid; Asparagine – HOOCCH2CH(NH2)CONH2; Methanol; Dimethyl ether – CH3OCH3; Methyl methacrylate – CH2=C(CH3)-COOCH3; Lauric acid – CH3(CH2)10COOH; Lauraldehyde; Lauryl alcohol
Five strokes: Cysteine – HSCH2CH(NH2)COOH; Peregal O – a non-ionic surfactant; Glycerol; Glycine – H2NCH2COOH; Ethylene glycol; Mannitol; Cortisone – 11-dehydro-17-hydroxycorticosterone; Phenol; Gentian violet – a commercial name with unclear meaning; Crotonic acid – CH3CH=CHCOOH; Crotonaldehyde
Six strokes: Camphor; Itaconic acid – CH2=C(COOH)-CH2COOH; Glacial acetic acid – acetic acid with concentration over 98%; Metol – p-methylaminophenol sulfate; Benzoin; Benzoic acid; Thymol – 5-methyl-2-isopropylphenol; Benzoyl peroxide; Phosgene – COCl2; Myristic acid – CH3(CH2)12COOH; Cinnamic acid; Cinnamaldehyde; Tryptophan – β-indolylalanine
Seven strokes: Mustard gas – ClCH2CH2SCH2CH2Cl; Threonine; Glutamic acid – HOOCCH2CH2CH(NH2)COOH; Aspirin – acetylsalicylic acid
Eight strokes: Oleic acid – CH3(CH2)7CH=CH(CH2)7COOH; Malic acid – HOOCCH(OH)CH2COOH; Bittermandelöl; Picric acid – 2,4,6-trinitrophenol; Phthalic anhydride; Stilbene – C6H5CH=CHC6H5; Lactic acid – CH3CH(OH)COOH; Soap – salts of higher fatty acids
Nine strokes: Collodion – see Pyroxylin; Oxalic acid – HOOC-COOH; Citric acid – HO-C(CH2COOH)-COOH; Formic acid – HCOOH; Freon – fluorochlorocarbons and fluorobromocarbons; Thiuram – tetramethyldithiocarbamide
Ten strokes: Tartaric acid – HOOCCH(OH)CH(OH)COOH; Ethanol; Cinnamic acid – CH3(CH2)10COOH; Tung oil acid – CH3(CH2)3(CH=CH)3(CH2)7COOH; Nitrocellulose (10–12% N); Cystine – HOOCCH(NH2)-CH2-S-S-CH2-CH(NH2)-COOH
Eleven strokes: Ricinoleic acid – CH3(CH2)5CH(OH)CH2CH=CH(CH2)7COOH; TNT – 2,4,6-trinitrotoluene; Urea – (H2N)2C=O
Twelve strokes: Fumaric acid – HOOC-CH=CH-COOH; Succinic acid – HOOC-CH2CH2-COOH; Stearic acid – CH3(CH2)16COOH; Nitroglycerin; Chloroform – CHCl3
Thirteen strokes: Formalin – aqueous solution of 37–40% formaldehyde; Lysine – H2N(CH2)3CH(NH2)COOH; Iodoform – triiodomethane
Fourteen strokes: Arginine – H2NC(=NH)CH2CH2CH2CH(NH2)COOH; Cerotic acid – CH3(CH2)24COOH; Malonic acid – HOOCCH2COOH