Crystals 2017, 7, 140; doi:10.3390/cryst7050140 www.mdpi.com/journal/crystals Crystals 2017, 7, 140 Crystals 2017, 7, 140 2 of 9 2 of 9 O HN H2N N N N O NH2 H O O CH3 · HCl CH3 FFigiguurere11..MMoolleeccuullaarr ssttrruuccttuurree sscchheemmeeooffVVCCVV. . In this ...