35233-71-7;2,5,2',5'-Tetramethyl-[2.2]paracyclophane;Tricyclo[8.2.2.24,7]hexadeca-4,6,10,12,13,15-hexaene,5,11,13,15-tetramethyl-,stereoisomer;Tricyclo(8.2.2.24,7)hexadeca-4,6,10,12,13,15-hexaene, 5,11,13,15-tetramethyl-, stereoisomer