PYRAZINE 290-37-9 NSC400221 ZINC01692439 82610_FLUKA AIDS059772 CHEBI:30953 InChI=1/C4H4N2/c1-2-6-4-3-5-1/h1-4 AIDS-059772 P56003_ALDRICH W401501_ALDRICH 1,4-Diazabenzene 1,4-Diazine CCRIS 1331 EINECS 206-027-6 NSC 400221 Paradiazine Piazine p-Diazine