Fig. 2. Key HMBC and 1H–1H in Characterization of diketopiperazine heterodimers as potential chemical markers for discrimination of two dominant black aspergilli, Aspergillus niger and Aspergillus tubingensis

Fig. 2. Key HMBC and 1H–1H COSY correlations of compounds 2, 3, and 4.Published as part of Xu, Ce, Xu, Kuo, Yuan, Xiao-Long, Ren, Guang-Wei, Wang, Xiao-Qiang, Li, Wei, Deng, Ning, Wang, Xiu-Fang & Zhang, Peng, 2020, Characterization of diketopiperazine heterodimers as potential chemical markers for discrimination of two dominant black aspergilli, Aspergillus niger and Aspergillus tubingensis, pp. 1-8 in Phytochemistry (112399) 176 on page 3, DOI: 10.1016/j.phytochem.2020.112399, http://zenodo.org/record/829575