(2,4,7-Trinitrofluoren-9-ylidene)malonitrile 1172-02-7 53724-78-0 58160-37-5 60778-41-8 9-Dicyanomethylene-2,4,7-trinitrofluorene 99749-75-4 EINECS 214-629-5 Propanedinitrile, (2,4,7-trinitro-9H-fluoren-9-ylidene)-