Disclosed are: a novel dinoflagellate alga; and a macrolide compound which can be used as a novel anticancer agent. Specifically disclosed is a macrolide compound produced by a dinoflagellate Amphidinium sp. Strain HYA002 or HYA0024. The macrolide compound has excellent proliferation-inhibiting effect against a human tumor cell and therefore can be used as a novel anticancer agent.
