PowerShell: how to create a registry entry with a forward slash in the name

PowerShell: how to create a registry entry with a forward slash in the name

I need to create the following registry entry HKLM:\software\bmc
software\control-m/agent but am having a problem due to the forward slash
before "agent"
I have no problem creating an entry that doesn't have the forward slash
For example:
PS C:\powershell> new-item -path 'HKLM:\software\bmc
software\control-mXXXagent'
But creating with the forward slash fails.
PS C:\powershell> new-item -path 'HKLM:\software\bmc
software\control-m/agent'
New-Item : The registry key at the specified path does not exist. At
line:1 char:10 + new-item <<<< -path 'HKLM:\software\bmc
software\control-m/agent' + CategoryInfo : InvalidArgument:
(HKEY_LOCAL_MACH...tware\control-m:String) [New-Item], ArgumentExceptio n
+ FullyQualifiedErrorId :
System.ArgumentException,Microsoft.PowerShell.Commands.NewItemCommand
And using the PowerShell backtic ` escape character doesn't help either.
PS C:\powershell> new-item -path 'HKLM:\software\bmc
software\control-m`/agent'
New-Item : The registry key at the specified path does not exist. At
line:1 char:10 + new-item <<<< -path 'HKLM:\software\bmc
software\control-m/agent' + CategoryInfo : InvalidArgument:
(HKEY_LOCAL_MACH...ware\control-m:String) [New-Item], ArgumentExceptio n +
FullyQualifiedErrorId :
System.ArgumentException,Microsoft.PowerShell.Commands.NewItemCommand
And advice would be appreciated. Thanks