An exact proof term for the current goal is CD_mul_1L {2} SNo complex_tag_fresh minus_SNo conj add_SNo mul_SNo SNo_0 SNo_1 (λx H ⇒ H) minus_SNo_0 add_SNo_0R mul_SNo_zeroL mul_SNo_zeroR mul_SNo_oneL mul_SNo_oneR.