BPA is a synthetic organic compound with a dimethylmethylene group, whereas BPS is a regular organic compound with a sulfonyl group. 4,4'-(propane-2,2-diyl)diphenol and 4,4'-Sulfonyldiphenol respectively.2 C6H5OH + H2SO4 (C6H4OH)2SO2 + 2 H2OWhy do you say BPS leeches more?