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Four of them have never before been detected on a comet: methyl isocyanate, acetone, propionaldehyde, and acetamide.”

This lucky accident allowed Goesmann and his colleagues to finger 16 organic chemicals, including four—methyl isocyanate, acetone, propionaldehyde, and acetamide—that have never before been detected on a comet.

Four of them, methyl isocyanate, acetone, propionaldehyde and acetamide, had not been seen on comets before.

Philae found 16 organic molecules in the space surrounding the comet; four of them — methyl isocyanate, acetone, propionaldehyde, and acetamide — have never been known to exist on comets before.