| abstract |
(57) [Problem] To provide an intermediate for producing an antibiotic MI43-37F11, which is used in a method for chemically producing an antibiotic MI43-37F11. A compound represented by the formula (IX) (wherein, R 2 and R 3 independently represent a hydrogen atom or a lower alkyl group, and R 4 represents a lower alkyl group). (IX) Antibiotic MI43-37F by hydrolyzing compound (IX) 11 is obtained. |