Butyl-meta-cycloheptylprodiginine-A revision of the structure of the former ortho-isomer.

Publisher Website
Google Scholar
Abstract
A red pigment produced by the actinomycete strain B 4358 was identified as butyl-meta-cycloheptylprodiginine (4) by 1H, 13C and correlation via long range coupling NMR spectra. It shows striking spectroscopic similarities to butyl-ortho-cycloheptylprodiginine (1), the structure of which needs to be revised.