Where is the pin for PC5 on the device configuration tool for Nucleo-L412RB-P?

I'm trying to use USART3 on an STM32L412 Nucleo board, but there doesn't seem to be a pin for PC5 in the device configuration tool. Pin 6 on connector CN6 is shown as PC5 on the card that came in the Nucleo board packaging. Some versions of the chip seem to have PC5 on pin 25, others don't have it at all. So can I use PC5 for USART3 on a Nucleo-L412RB-P, or must I use PC11 which seem to be the only option? (I'm using PB10 and PB11 for TIM2 Channels 3 and 4.)