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diltiazem 2 cream compound Over the last year, scientists have kept a close eye on ISON and its jets of gas. That its jets have released lots of carbon dioxide, diatomic carbon, tricarbon, ammonia, methane and nitrogen was not a surprise; these molecules are necessary for life as we know it, and scientists have long thought that they were brought to Earth by comets. But the fact that ISON has very little carbon monoxide was unexpected.