iron(3+) cyclo{glycyl-N~5~-[(2Z)-5-hydroxy-3-methylpent-2-enoyl]-N~5~-oxidoornithyl-N~5~-[(2E)-5-hydroxy-3-methylpent-2-enoyl]-N~5~-oxidoornithyl-N~5~-[(2E)-5-hydroxy-3-methylpent-2-enoyl]-N~5~-oxidoornithylserylseryl}