(EN) A method of producing a compound shown by formula (Yl) or formula (Y2), or a salt thereof: [Chemical formula 37](wherein Rx is carbocyclyl optionally substituted by substituent E, heterocyclyl optionallysubstituted by substituent E, carbocyclyl lower alkyl optionally substituted by substituent E, orheterocyclyl lower alkyl optionally substituted by subtituent E)comprising steps of:(StepC")reacting a compound shown by formula (Wl):[Chemical formula 38]with a compound shown by formula (V3), or a salt mereof: [Chemical formula 39]H2N R6d(V3) (wherein R^ is lower alkyl optionally substituted by substituent E, or lower alkenyl optionally substituted by substituent E)to obtain a compound shown by formula (W2), or a salt thereof: [Chemical formula 40](wherein R^ is lower alkyl optionally substituted by substituent E, or lower alkenyl optionallysubstituted by substituent E), and(StepD")reacting a compound shown by formula (W2) witii (i?)-3-amino-burane-l-ol or (S)-2-amino-propan-l-ol to obtain a compound shown by formula (W3) or formula (W4), or a salt diereof:[Chemical formula 41]