Cycloheptane 291-64-5 InChI=1/C7H14/c1-2-4-6-7-5-3-1/h1-7H 28810_FLUKA Cycloheptane [UN2241] [Flammable liquid] EINECS 206-030-2 NSC5164 Heptamethylene HSDB 59 Suberane UN2241 C98403_ALDRICH NSC 5164