Extraction technology for active constituents in Dracocephali Moldavici Herba and comparison on contents of Dracocephali Moldavici Herba from various habitats Chemical constituents from Mentha haplocalyx Studies on chemical constituents from herb of Dracocephalum moldavica Research on separation and purification of extract from Dracocephalum moldevica with macroporous resins Studies on Chemical Constituents from Dracocephalum moldavica L. Separation and authentication of tilianin and quality standards of semen of Dracocephalum moldavia Simultaneous determination of tilianin and agastachoside in Dracocephalum moldavica by HPLC Simultaneous determination of tilianin and agastachoside in Dracocephalum moldavica by HPLC Studies on involatile constituents of Mentha haplocalyx