This section is from the book "A Manual of Materia Medica and Pharmacology", by David M. R. Culbreth. Also available from Amazon: Manual of Materia Medica and Pharmacology.
(Synthetic Remedies.)
It should be borne in mind, as incidentally referred to on page 811, that the possibilities which the constructive processes of organic chemistry open to us are almost beyond limit. Not a few of those products which we have solely heretofore, and do mostly even now, depend upon crude vegetable drugs for their origin, are at the present time being built up synthetically to such perfection as often to challenge recognition of distinctive sources. Of these, the Pharmacopoeia would recognize more than it does were it not for partial secrecy in working formula and manufacture. Quite a number are employed so universally that the present day text-book excluding them might be considered more or less incomplete. In order that the chemical relationship may be better understood they have been treated, so far as practicable, in the same ordered sequence as adopted in Part IV. Before taking them up individually, it may be well to show, by graphic formulas, the facility with which the construction and substitution of one atom or a group of atoms for others may be effected - a process which invariably results in giving each time a different substance. In order to do this, and to carry along direct relationship, some of the compounds previously treated will have to be introduced at the sacrifice of repetition, but this may be considered not in the least a disadvantage to the student.
The majority of these synthetics which contain sulphur are hypnotics or sleep-producers, while those containing nitrogen are antipyretics or anodynes.

Methane=CH4

Ethane=C2H6

Ethyl Alcohol=C2H5OH

Aldehyde=C2H4O

Acetic Acid=C2H4O2

Ethylamine=C2H5NH2

Formaldehyde=CH2O

Formamide=CHO.NH2

Mercaptan=C2H6SH

Sulphonal=C7 H16S2O4

Trional=C8H18O4S2

Urethane=C3H7NO2

Thiophene-di-iodide=C4H2I2S

Benzene (Benzol)=C6H6

Aniline=C6H5NH2

Phenol (Carbolic Acid)= C6H5OH

Phenacetin=C10H13NO2

Acetanilid=C8H9NO

Exalgine=C9H11NO

Saccharin=C7H5NO3S

Antipyrine=C11H12N2O

Pyridine=C5H5N

Chinoline=C9H7N

Anisic Acid=C8H8O8
Hydrcarbons.

Benzene C6H6

Nitro-benzene=C6H5NO2

Toluene, Methyl-benzene== C6H5.CH3

Xylene, Dimethyl-benzene= C6H4(CH3)2

Cymene, Methyl-propyl-benzene=C6H4.CH3.C3H7
Alcohols.

Phenol or Carbolic Acid= C6H5OH

Resorcinol =C6H4(OH)2

Pyrogallol-C6H3(OH)3

Cresol=C6H4.CH3.OH

Thymol=C6H3CH3.C3H7OH
Acids.

Benzoic Acid=C8H5.CO2H

Phtalic Acid=C8H4(CO2H)2

Gallic Acid=C6H2CO2H.(OH)2

Salicylic Acid=C6H4.CO2H.OH

Benzaldehyde, Oil of Bitter Almond-C6H5.COH
 
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