PROGRESS ON X-RAY STRUCTURAL STUDIES ON CALIXARENE FIRST X-RAY STRUCTURE 1968 BY EARDTMAN et al., CCDC SEARCH (26 TH APRIL 2014) 430 STRUCTURES REPORTED RATE OF PROGRESS ABOUT 9 STRUCTURES/YEAR CALIX[4]RESORCINARENE AROMATIC LINGKAGER ABOUT 10 STRUCTURES REPORTED