Abstract: A crystalline form I of a compound represented by Formula (VII-1): having characteristic peaks appearing at lattice spacing (d) of 7.34, 5.66, 5.53, 5.30, 5.02, 4.66, 4.37, 4.28, 4.06, 3.68, 3.62, 3.47, 3.36, 3.30, 3.16, 3.11, 3.03, 2.99 and 2.50 ? in the powder X-ray diffraction pattern.

Abstract: A crystalline form I of a compound represented by Formula (VII-1): having characteristic peaks appearing at lattice spacing (d) of 7.34, 5.66, 5.53, 5.30, 5.02, 4.66, 4.37, 4.28, 4.06, 3.68, 3.62, 3.47, 3.36, 3.30, 3.16, 3.11, 3.03, 2.99 and 2.50 ? in the powder X-ray diffraction pattern.

Abstract: A crystalline form I of a compound represented by Formula (VII-1): having characteristic peaks appearing at lattice spacing (d) of 7.34, 5.66, 5.53, 5.30, 5.02, 4.66, 4.37, 4.28, 4.06, 3.68, 3.62, 3.47, 3.36, 3.30, 3.16, 3.11, 3.03, 2.99 and 2.50 ? in the powder X-ray diffraction pattern.

Abstract: A process for producing a compound of the following Formula (VII-CR): The process involving providing a compound represented by the following Formula (VI): in a case where the R3ONHC(?O) side chain in the compound of the Formula (VI) has a protecting group, removing the protecting group from the compound of the Formula (VI) with an acid, and adding an ester-based poor solvent to the resultant reaction solution to precipitate the compound of Formula (VII-CR), wherein in the compounds of the Formulas (VII-CR) and (VI), R3 is a C1-6 alkyl or a heterocycle.

Abstract: A process for producing a compound of the following Formula (VII-CR): The process involving providing a compound represented by the following Formula (VI): in a case where the R3ONHC(?O) side chain in the compound of the Formula (VI) has a protecting group, removing the protecting group from the compound of the Formula (VI) with an acid, and adding an ester-based poor solvent to the resultant reaction solution to precipitate the compound of Formula (VII-CR), wherein in the compounds of the Formulas (VII-CR) and (VI), R3 is a C1-6 alkyl or a heterocycle.

Abstract: A crystalline form of a diazabicyclooctane derivative represented by the following Formula (VII), and processes for producing the same:

Abstract: A process for producing a diazabicyclooctane derivative represented by Formula (IV) and intermediates thereof by carrying out the following steps: wherein P is an NH protecting group capable of being removed with acid; R1 is 2,5-dioxopyrrolidin-1-yl, 1,3-dioxo-3a,4,7,7a-tetrahydro-1H-isoindol-2(3H)-yl, 1,3-dioxohexahydro-1H-isoindol-2(3H)-yl, or 3,5-dioxo-4-azatricyclo[5.2.1.02.6]dec-8-en-4-yl; R2 is hydrogen, ClCO— or Cl3COCO—; R3 is C1-6 alkyl or heterocyclyl, or forms a 3- to 7-membered heterocyclic ring together with the —O—NH— to which it is attached; and OBn is benzyloxy.

Abstract: A process for producing a compound represented by a Formula (III), including reacting a compound of the following formula with a compound selected from the group consisting of 1-hydroxypyrrolidine-2,5-dione, 2-hydroxy-3a,4,7,7a-tetrahydro-1H-isoindol-1,3(2H)-dione, 2-hydroxyhexahydro-1H-isoindol-1,3(2H)-dione and 4-hydroxy-4-azatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione, carrying out a carbonylation to obtain a compound of the following formula removing the NH protecting group P and treating the resultant compound with a base to produce a compound represented by the following formula wherein OBn is benzyloxy and R2 is hydrogen, ClCO— or Cl3COCO—.

Abstract: A process for producing a compound represented by a Formula (III), including reacting a compound of the following formula with a compound selected from the group consisting of 1-hydroxypyrrolidine-2,5-dione, 2-hydroxy-3a,4,7,7a-tetrahydro-1H-isoindol-1,3(2H)-dione, 2-hydroxyhexahydro-1H-isoindol-1,3(2H)-dione and 4-hydroxy-4-azatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione, carrying out a carbonylation to obtain a compound of the following formula removing the NH protecting group P and treating the resultant compound with a base to produce a compound represented by the following formula wherein OBn is benzyloxy and R2 is hydrogen, ClCO— or Cl3COCO—.

Abstract: A crystalline form of a diazabicyclooctane derivative represented by the following Formula (VII), and processes for producing the same:

Abstract: A process for producing a diazabicyclooctane derivative represented by Formula (IV) and intermediates thereof by carrying out the following steps: wherein P is an NH protecting group capable of being removed with acid; R1 is 2,5-dioxopyrrolidin-1-yl, 1,3-dioxo-3a,4,7,7a-tetrahydro-1H-isoindol-2(3H)-yl, 1,3-dioxohexahydro-1H-isoindol-2(3H)-yl, or 3,5-dioxo-4-azatricyclo[5.2.1.02.6]dec-8-en-4-yl; R2 is hydrogen, ClCO— or Cl3COCO—; R3 is C1-6 alkyl or heterocyclyl, or forms a 3- to 7-membered heterocyclic ring together with the —O—NH— to which it is attached; and OBn is benzyloxy.