Franck, B <br/><br/>
A N,N',N'',N'''-tetramethylporphyrinogen.  [electronic resource] 

 -  Angewandte Chemie (International ed. in English)  1975 
 - 424 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1433-7851 
<br/><br/><label>Standard No.: </label>10.1002/anie.197504241  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cyclization<br/>Methylation<br/>Porphyrinogens--chemical synthesis