```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns3:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/">
    <query_name>VITAM-Busul-Alkyl@15:32:55</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>5</hlevel>
            <item_name>VITAMIN B12 UNSAT BIND CAPA (LOINC:2171-7)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB16) Chemistry\(LLB31) Anemia Related Studies\B12USAT\LOINC:2171-7\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Chemistry \ Anemia Related Studies \ B12 Unsaturated Binding (Group:B12USAT) \ Vitamin b12 unsat bind capa (LOINC:2171-7)</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>2</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>4</hlevel>
            <item_name>Busulfan</item_name>
            <item_key>\\i2b2_MEDS\i2b2\Medications\MUL\(LME55) antineoplastics\(LME56) alkylating agents\busulfan\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>medications \ antineoplastics \ alkylating agents \ busulfan</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>3</hlevel>
            <item_name>Alkylating agents</item_name>
            <item_key>\\i2b2_MEDS\i2b2\Medications\MUL\(LME55) antineoplastics\(LME56) alkylating agents\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>medications \ antineoplastics \ alkylating agents</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>3</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>3</hlevel>
            <item_name>Alkylating agents</item_name>
            <item_key>\\i2b2_MEDS\i2b2\Medications\MUL\(LME55) antineoplastics\(LME56) alkylating agents\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>medications \ antineoplastics \ alkylating agents</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns3:query_definition>

```

I want to find patients who have had a Vitamin B12 Unsaturated Binding (LOINC:2171-7) lab test result and were prescribed Busulfan medication, as well as those who were prescribed other alkylating agents as part of their treatment. The query should have a specificity scale of 0 and a panel timing of "ANY," indicating that the order of the events does not matter. The accuracy scale for each panel is set to 100, meaning that all items in each panel must be present for the patient to match the query. Panel 1 focuses on the Vitamin B12 Unsaturated Binding test, while Panel 2 and 3 focus on the medications, with Panel 2 specifically looking for Busulfan and Panel 3 looking for any alkylating agents.