The derivatives of glycyrrhizin acid--dihydrazidohydrazose of glycyrrhizin acid (DHGA), DHGA plus benzaldehyde, DHGA plus 5-nitrofurfurol, DHGA plus furfurol, glycyrrhizin acid, methylmethioninsulfonium-glycyrrhizinate, sodium salt of 18-glycyrrhetic acid, and potassium salt of glycyrrhizin