S-(2-aminoethyl) Isothiourea (dihydrobromide) is a non-selective inhibitor of all NOS isoforms. For human nNOS eNOS and iNOS the Ki values are 1.8 2.1 and 0.59 μM respectively.

Neotuberostemonine (NTS) is one of the main antitussive alkaloids in the root of Stemona tuberosa Lour it has a significant protective effect on bleomycin (BLM)-induced pulmonary fibrosis through suppressing the recruitment and M2 polarization of macrophages. Neotuberostemonine demonstrates antitussive properties in guinea pigs.

Anhydronotoptol (4-{[(2E,5E)-3,7-dimethylocta-2,5,7-trien-1-yl]oxy}-7H-furo[3,2-g]chromen-7-one), a natural compound extracted from the umbelliferae plant Qiangwu, is a potent inhibitor of nitric oxide production, inhibiting LPS-induced NO production in RAW 264.7 cells with an IC50 value of 36.6 μM.