[C:1]([C:3]1[CH:8]=[CH:7][C:6]([N:9]2[C:13](=[O:14])[C:12]3([CH2:19][CH2:18][O:17][CH2:16][CH2:15]3)[N:11]([CH2:20][CH2:21][CH2:22][C:23]([O:25]CC)=[O:24])[C:10]2=[O:28])=[CH:5][C:4]=1[C:29]([F:32])([F:31])[F:30])#[N:2].CO.[OH-].[Na+]>O>[C:1]([C:3]1[CH:8]=[CH:7][C:6]([N:9]2[C:13](=[O:14])[C:12]3([CH2:19][CH2:18][O:17][CH2:16][CH2:15]3)[N:11]([CH2:20][CH2:21][CH2:22][C:23]([OH:25])=[O:24])[C:10]2=[O:28])=[CH:5][C:4]=1[C:29]([F:30])([F:32])[F:31])#[N:2]522 mg of the product of Example 6 and 20 ml of methanol were mixed together and the solution was heated to 30° C., then returned to ambient temperatures 2 ml of 2N sodium hydroxide were added and the reaction medium stood for 4 hours and 30 minutes, then was poured into 30 ml of water and adjusted to pH 2-3. Extraction was carried out 3 times with ethyl acetate and the organic phase was washed with water, then with salt water, dried and purified on silica with methylene chloride-methanol: 9-1 as eluant. Then, solidification was carried out by trituration in 0.2 ml of isopropanol and 5 ml of ether to obtain 345 mg of the expected product (white crystals) melting at 151°-152° C.
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