Complex sentence: There have been a few attempts to synthetize benzotriyine, e.g. by pyrolysis of mellitic anhydride, but apparently none has been successful yet (as of 2009).
Split into simpler sentences: There have been a few attempts to synthetize benzotriyine, e.g. by pyrolysis of mellitic anhydride. DOI: 10.1021/jo01348a046 but apparently none has been successful yet (as of 2009).