The SMILES O=C1OC(=O)c2ccc3c4c(ccc1c24)C(=O)OC3=O represents a molecule with an rat LD50 (oral exposure) of 1.559.
The {SMILES__description} {SMILES#} {#represents|is from!} a molecule with an {acute_toxicity__names__noun} of {acute_toxicity#}.