Concept:
Buddhist ethics is based on moral discipline, compassion, non-violence, right conduct and liberation from suffering.
Important Buddhist ethical concepts include:
\[
\text{Panchashila}
\]
\[
\text{Brahma Vihara}
\]
\[
\text{Asthang Marg}
\]
Step 1: Check Panchashila.
Panchashila means the five moral precepts of Buddhism.
So, it is associated with Buddhist ethics.
Step 2: Check Brahma Vihara.
Brahma Vihara refers to four sublime states:
\[
\text{Maitri, Karuna, Mudita, Upeksha}
\]
These are important in Buddhist ethics.
Step 3: Check Asthang Marg.
Asthang Marg means the Noble Eightfold Path.
It is central to Buddhist ethical and spiritual practice.
Step 4: Check Mahavrat.
Mahavrat means great vows.
It is mainly associated with Jain ethics, especially the vows of Jain monks.
So, Mahavrat is not associated with Buddhist ethics.
Hence:
\[
\boxed{\text{Mahavrat}}
\]