Carbocisteine-13C3-1 (Carbocysteine-13C3-1) is 13C labeled Carbocisteine. Carbocisteine is an orally active mucolytic agent. Carbocisteine attenuates the phosphorylation of NF-kappaB p65 and ERK1/2. Carbocisteine modulates Nrf2/HO-1 and NFkappaB interplay. Carbocisteine inhibits Apoptosis. Carbocisteine is used in chronic obstructive pulmonary disease (COPD) research[1][2][3][4][5][6][7][8][9][10][11][12][13].