claim: Macklemore has never sung with Ryan Lewis.
evidence: 17α-Dihydroequilin , or α-dihydroequilin , also known as 7-dehydro-17α-estradiol , as well as estra-1 ,3,5 -LRB- 10 -RRB- ,7 - tetraen-3 ,17 α-diol , is a naturally occurring , steroidal estrogen found in horses that is closely related to equilin , equilenin , and 17α-estradiol .. naturally occurring. natural product. estrogen. estrogen. equilin. equilin. equilenin. equilenin. 17α-estradiol. 17α-estradiol. The compound , as the 3-sulfate ester sodium salt , is present in conjugated equine estrogens -LRB- Premarin -RRB- , a pharmaceutical extract of the urine of pregnant mares , and is the third highest quantity constituent in the formulation -LRB- 13.8 % -RRB- .. sulfate. sulfate. ester. ester. sodium. sodium. salt. salt ( chemistry ). Premarin. Premarin. pharmaceutical. pharmaceutical drug. extract. extract. urine. urine. pregnant. pregnancy