Indonesia released a set of 2 stamps on 23 March 2011 to celebrate the International Year of Chemistry (IYC). The first stamp features the chemical structure of a xanthone derivative, Artoindonesianin C, derived from the plant Artocarpus teysmanii (a relative of the jackfruit tree), the second stamp (not shown) features the IYC logo. Many forms of artoindonesianins are extracted from the Artocarpus family of plants, for example, Artoindonesianin A & B are derived from Artocarpus chempeden, that is the chempedak tree. Some of these artoindonesianins have been found to be cytotoxic, so they are candidate compounds for anti-cancer research.
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