fragmentary 1H NMR assignment (aromatic OCH3, NCH3, indole
NH, COOCH3 and OCOCH3 groups) of VLB was reported in
1962 [12]. Interestingly, almost 20 years had to pass until the first
complete 1H NMR assignment of VLB appeared in the literature in
1980 [56], accomplished on a 360 MHz spectrometer