<!-- (C) International Organization for Standardization 1991
     Permission to copy in any form is granted for use with
     conforming SGML systems and applications as defined in
     ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
     <!ENTITY % ISOCHEM  PUBLIC
       "ISO 9573-13:1991//ENTITIES Chemistry //EN">
     %ISOCHEM;
-->
<!ENTITY benzen    "[benzen  ]"> <!--benzene ring-->
<!ENTITY benzena   "[benzena ]"> <!--benzene ring, one double binding-->
<!ENTITY benzenb   "[benzenb ]"> <!--benzene ring, one double binding-->
<!ENTITY benzenc   "[benzenc ]"> <!--benzene ring, one double binding-->
<!ENTITY benzend   "[benzend ]"> <!--benzene ring, one double binding-->
<!ENTITY benzene   "[benzene ]"> <!--benzene ring, one double binding-->
<!ENTITY benzenf   "[benzenf ]"> <!--benzene ring, one double binding-->
<!ENTITY benzeng   "[benzeng ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenh   "[benzenh ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzeni   "[benzeni ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenj   "[benzenj ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenk   "[benzenk ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenl   "[benzenl ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenm   "[benzenm ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenn   "[benzenn ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzeno   "[benzeno ]"> <!--benzene ring, two double bindings-->
<!ENTITY benzenp   "[benzenp ]"> <!--benzene ring, three double bindings-->
<!ENTITY benzenq   "[benzenq ]"> <!--benzene ring, three double bindings-->
<!ENTITY benzenr   "[benzenr ]"> <!--benzene ring, circle-->
<!ENTITY hbenzen   "[hbenzen ]"> <!--horizontal benzene ring-->
<!ENTITY hbenzena  "[hbenzena]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzenb  "[hbenzenb]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzenc  "[hbenzenc]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzend  "[hbenzend]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzene  "[hbenzene]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzenf  "[hbenzenf]"> <!--horizontal benzene ring, one double binding-->
<!ENTITY hbenzeng  "[hbenzeng]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenh  "[hbenzenh]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzeni  "[hbenzeni]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenj  "[hbenzenj]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenk  "[hbenzenk]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenl  "[hbenzenl]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenm  "[hbenzenm]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenn  "[hbenzenn]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzeno  "[hbenzeno]"> <!--horizontal benzene ring, two double bindings-->
<!ENTITY hbenzenp  "[hbenzenp]"> <!--horizontal benzene ring, three double bindings-->
<!ENTITY hbenzenq  "[hbenzenq]"> <!--horizontal benzene ring, three double bindings-->
<!ENTITY hbenzenr  "[hbenzenr]"> <!--horizontal benzene ring, circle-->