ChemInform Abstract: Organometallic Derivatives of Hormonal Steroids: 500‐MHz One‐ and Two‐ Dimensional NMR Spectra of 17α‐Propynylestra‐1,3,5(10)‐triene‐3,17β‐ diol and Its Co2(CO)6 and (C5H5)2Mo2(CO)4 Complexes. Journal Articles