2-Nitro-7-methoxynaphtho(2,1-b)furan 7-Methoxy-2-nitronaphtho(2,1-b)furan 75965-74-1 BRN 5749492 CCRIS 4520 NAPHTHO(2,1-b)FURAN, 7-METHOXY-2-NITRO- NSC 329223 R 7000 R7000