PROXIMATE CONSTITUENTS OF THE ANIMAL BODY 55 



Benzyl alcohol 

 Benzylaldehyde 

 Benzole acid 



C 6 H 5 .CH 2 OH. 



C 6 H 5 .CHO. 



C 6 H 5 .COOH. 



Of the disubstitution compounds, we need only mention the following : 

 The dihydroxybenzenes : 



Pyrocatechin or catechol Resorcinol Hydroquinone 



OH 



OH 



OH 



ortho- meta- 



Salicylic acid (o-hydroxybenzoic acid) C 6 H 5 < 



Tyrosin (parahydroxyphenyl a-alanine) : 



OH 



COOH. 



CH 2 .CH(NH 2 )COOH. 

 Examples of trisubstitution derivatives of benzene are : 



OH 

 XX 



OH 



Pyrogallol 



OH 



Homogentisic acid 



CH 2 .COOH 



Adrenaline 



Picric acid 



OH 



CH.OH 



CH 2 .NH(CH S ) 

 OH 



N0 9 f 7 ^ N0 2 



N0 a 



