Cyclopiane-type diterpenes from the deep-sea-derived fungus Penicillium commune MCCC 3A00940

•Discover natural anti-food allergic components from the deep-sea fungus.•Four new (1–3, 5) and 11 known compounds were obtained.•Compounds 1–4 are four rare cyclopiane diterpenes.•Conidiogenone J (1) is the first natural enantiomer of cyclopiane diterpene.•Two compounds (6 and 14) exhibited moderate antiallergic effects.