The reddish-brown color of human feces is derived from stercobilin, a tetrapyrrole[?] chemical compound created by bacterial action on bilirubin and subsequent oxidation.
... 1995 Buffy Sainte-Marie[?]
1996 David Clayton-Thomas[?]
1996 Denny Doherty[?]
1996 John Kay[?]
1996 Dominic Troiano[?]
1996 Zal Yanovsky
1997 Gil Evans[?]
...