1 3 5 7-tetrafluoro cyclooctatetraene point group July 8, 2019 16 32 64 128 1 3 5 7-cyclooctatetraene 1 3 5 7-cyclooctatetraene structure 1 3 5 7-tetranitro-1 3 5 7-tetraazacyclooctane 4 4 5 5-tetrafluoro-1 3-dioxolan-2-one 2 3 5 6-tetrafluoro-7 7 8 8-tetracyanoquinodimethane